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<title>Slashed zero</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Slashed zero</span></span>

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</style><div role="note" class="hatnote navigation-not-searchable">For other uses, see <a href="%E2%88%85_(disambiguation)" class="mw-redirect mw-disambig" title="∅ (disambiguation)">∅ (disambiguation)</a>.</div>

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<p>The <b>slashed zero</b>, <span class="mw-default-size skin-invert" typeof="mw:File"></span>, is a representation of the <a href="Arabic_digit" class="mw-redirect" title="Arabic digit">Arabic digit</a> <a href="Zero" class="mw-redirect" title="Zero">zero</a> ("0") with a <a href="Slash_(punctuation)" title="Slash (punctuation)">slash</a> through it. This variant zero glyph is often used to distinguish the digit zero from the <a href="Latin_script" title="Latin script">Latin script</a> letter <a href="O" title="O">O</a> anywhere that the distinction needs emphasis, particularly in <a href="Encoding" class="mw-redirect" title="Encoding">encoding</a> systems, scientific and engineering applications, <a href="Computer_programming" title="Computer programming">computer programming</a> (such as <a href="Software_development" title="Software development">software development</a>), and telecommunications. It thus helps to differentiate characters that would otherwise be <a href="Homoglyph" title="Homoglyph">homoglyphs</a>. It was commonly used during the <a href="Punched_card" title="Punched card">punch card</a> era, when programs were typically written out by hand, to avoid ambiguity when the character was later typed on a <a href="Card_punch" class="mw-redirect" title="Card punch">card punch</a>.

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<div class="mw-heading mw-heading2"><h2 id="Usage">Usage</h2></div>

<p>The slashed zero is used in a number of fields in order to avoid confusion with the letter "O". It is used by <a href="Computer_programmer" class="mw-redirect" title="Computer programmer">computer programmers</a>, in recording <a href="Amateur_radio" title="Amateur radio">amateur radio</a> call signs and in military radio, as logs of such contacts tend to contain both letters and numerals.

</p><p>The slashed zero was used on teleprinter circuits for weather applications. In this usage it was sometimes called communications zero.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>

</p><p>The slashed zero can be used in <a href="Stoichiometry" title="Stoichiometry">stoichiometry</a> to avoid confusion with the symbol for <a href="Oxygen" title="Oxygen">oxygen</a> (capital O).

</p><p>The slashed zero is also used in charting and documenting in the medical and healthcare fields to avoid confusion with the letter "O". It also denotes an absence of something (similar to the usage of an "<a href="Empty_set" title="Empty set">empty set</a>" character), such as a sign or a symptom.

</p><p>Slashed zeros are used on <a href="Vehicle_registration_plates_of_New_Zealand" title="Vehicle registration plates of New Zealand">New Zealand number plates</a>.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>

<p>The slashed zero predates computers, and is known to have been used in the twelfth and thirteenth centuries.<sup id="cite_ref-FOOTNOTECajori192851_3-0" class="reference"><a href="#cite_note-FOOTNOTECajori192851-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p><p>In the days of the <a href="Typewriter" title="Typewriter">typewriter</a>, there was no key for the slashed zero. Typists could generate it by first typing either an uppercase "O" or a zero and then <a href="Backspace" title="Backspace">backspace</a>, followed by typing the slash key. The result would look very much like a slashed zero.

</p><p>It is used in many <a href="Baudot_code" title="Baudot code">Baudot</a> <a href="Teleprinter" title="Teleprinter">teleprinter</a> applications, specifically the keytop and typepallet that combines "P" and slashed zero.<sup id="cite_ref-Teletype-1948-04-Bul-1164B_4-0" class="reference"><a href="#cite_note-Teletype-1948-04-Bul-1164B-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Additionally, the slashed zero is used in many <a href="ASCII" title="ASCII">ASCII</a> graphic sets descended from the default typewheel on the <a href="Teletype_Model_33" title="Teletype Model 33">Teletype Model 33</a>.<sup id="cite_ref-Teletype-Bul-1184B_5-0" class="reference"><a href="#cite_note-Teletype-Bul-1184B-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>

</p><p>The use of the slashed zero by many computer systems of the 1970s and 1980s inspired the 1980s <a href="Space_rock" title="Space rock">space rock</a> band <a href="Underground_Zer%C3%B8" title="Underground Zerø">Underground Zerø</a> to use a <a href="Heavy_metal_umlaut" class="mw-redirect" title="Heavy metal umlaut">heavy metal umlaut</a> <a href="Scandinavian_language" class="mw-redirect" title="Scandinavian language">Scandinavian</a> <a href="Vowel" title="Vowel">vowel</a> <i><a href="%C3%98" title="Ø">ø</a></i> in the band's name and as the band logo on all their album covers.

</p><p>Along with the <a href="Westminster_(typeface)" title="Westminster (typeface)">Westminster</a>, <a href="MICR" class="mw-redirect" title="MICR">MICR</a>, and <a href="OCR-A" title="OCR-A">OCR-A</a> fonts, the slashed zero became one of the things associated with <a href="Hacker_culture" title="Hacker culture">hacker culture</a> in the 1980s. Some cartoons depicted computer users talking in <a href="Binary_code" title="Binary code">binary code</a> with 1s and 0s using a <i>slashed zero</i> for the 0.

</p><p>Slashed zeroes have been used in the <a href="Adobe_Flash" title="Adobe Flash">Flash-based</a> artwork of <a href="Young-Hae_Chang_Heavy_Industries" title="Young-Hae Chang Heavy Industries">Young-Hae Chang Heavy Industries</a>, notably in their 2003 work, <i>Operation Nukorea</i>. The reason for their use is unknown, but has been conjectured to be related to themes of "negation, erasure, and absence".<sup id="cite_ref-Greenfield-2013-04-13-piano_6-0" class="reference"><a href="#cite_note-Greenfield-2013-04-13-piano-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Similar_symbols">Similar symbols</h2></div>

<p>The slashed zero has the disadvantage that it can be confused with several other symbols. See the <a href="%C3%98_(disambiguation)" class="mw-disambig" title="Ø (disambiguation)">disambiguation page for the symbol Ø</a> for a comprehensive listing.

</p>

<div class="mw-heading mw-heading2"><h2 id="Representation_in_Unicode_and_HTML">Representation in Unicode and HTML</h2></div>

<caption>Unicode representation

</caption>

<th>Glyph</th>

<th>Variation sequence</th>

<th>Description of appearance

</th></tr>

<tr>

<td>short diagonal stroke form of DIGIT ZERO

</td></tr></tbody></table>

<p>In <a href="Unicode" title="Unicode">Unicode</a>, slashed zero is considered a standardized typographic variation of the <a href="Arabic_numerals" title="Arabic numerals">Arabic digit</a> zero <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base,#202122); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">0</span>, which is code point <style data-mw-deduplicate="TemplateStyles:r886049734">

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</style><span class="monospaced">U+0030</span>. Appending <a href="Variation_Selector" class="mw-redirect" title="Variation Selector">Variation Selector 1</a> <span class="monospaced">U+FE00</span> after the zero creates the "short diagonal stroked form",<sup id="cite_ref-unicodevariants_7-0" class="reference"><a href="#cite_note-unicodevariants-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> on this browser it produces <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base,#202122); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">0︀</span>.

</p><p>Note that the above should not be confused with the "slashed zero variant of the <a href="Empty_set" title="Empty set">empty set</a>", <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \emptyset }">

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle \emptyset }</annotation>

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</math></span><img src="./6af50205f42bb2ec3c666b7b847d2c7f96e464c7.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.505ex; width:1.162ex; height:2.509ex;" alt="{\displaystyle \emptyset }" loading="lazy"></span>, as popularized by Donald Knuth's <a href="TeX" title="TeX">TeX</a>.<sup id="cite_ref-emptyset_8-0" class="reference"><a href="#cite_note-emptyset-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Unicode represents that character as the empty set (∅) with variation selector 1.<sup id="cite_ref-unicodevariants_7-1" class="reference"><a href="#cite_note-unicodevariants-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>

</p><p>Prior to Unicode 9.0, there was no <a href="Code_point" title="Code point">code point</a> defined for altering the visual appearance of zero. This meant that the slashed zero <a href="Glyph" title="Glyph">glyph</a> was displayed for <span class="monospaced">U+0030</span> only—<i>and then always</i>—in fonts whose designer chose the option. Successful display on a particular local system depended on making sure that such a font was available — either via the system's font files or via <a href="Font_embedding" title="Font embedding">font embedding</a> — and selected. (See also, <a class="mw-selflink-fragment" href="#Combining_solidus">Combining solidus</a> below.)

</p><p>In <a href="HTML" title="HTML">HTML</a>, slashed zero can be enabled by using <a href="CSS" title="CSS">CSS</a> property <code class="mw-highlight mw-highlight-lang-css mw-content-ltr" dir="ltr"><span class="nt">font-variant-numeric</span><span class="o">:</span><span class="w"> </span><span class="nt">slashed-zero</span></code> or alternatively <code class="mw-highlight mw-highlight-lang-css mw-content-ltr" dir="ltr"><span class="nt">font-feature-settings</span><span class="o">:</span><span class="w"> </span><span class="s1">'zero'</span></code>. If the font has support for <a href="OpenType" title="OpenType">OpenType</a> feature tag <code>zero</code>, slashed zero will be substituted.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading2"><h2 id="Typography">Typography</h2></div>

<p>In most typographic designs, the slash of a slashed zero usually does not extend past the ellipse. Compare this to the <a href="Scandinavian_language" class="mw-redirect" title="Scandinavian language">Scandinavian</a> <a href="Vowel" title="Vowel">vowel</a> "<a href="%C3%98" title="Ø">Ø</a>", the "<a href="Empty_set" title="Empty set">empty set</a>" symbol "∅" and the diameter symbol <a href="%E2%8C%80" class="mw-redirect" title="⌀">⌀</a>.

</p><p>A convention common on early line <a href="Computer_printer" class="mw-redirect" title="Computer printer">printers</a> left zero unornamented but added a tail or hook to the letter-O so that it resembled an inverted <a href="Q" title="Q">Q</a> (like U+213A <a href="%E2%84%BA" class="mw-redirect" title="℺">℺</a>) or <a href="Cursive" title="Cursive">cursive</a> capital letter-O (<span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \,{\mathcal {O}}\,}">

</mrow>

</mstyle>

</mrow>

<annotation encoding="application/x-tex">{\displaystyle \,{\mathcal {O}}\,}</annotation>

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</math></span><img src="./3017ed47cd4fe2398c1c977037051d5f8caebc9d.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:2.624ex; height:2.176ex;" alt="{\displaystyle \,{\mathcal {O}}\,}" loading="lazy"></span>).<sup id="cite_ref-Bemer-1967-08-ACM_12-0" class="reference"><a href="#cite_note-Bemer-1967-08-ACM-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup>

</p><p>In the <a href="Fixedsys" title="Fixedsys">Fixedsys</a> typeface, the numeral 0 has two internal barbs along the lines of the slash. This appears much like a white "S" within the black borders of the zero.

</p><p>In the <a href="FE-Schrift" title="FE-Schrift">FE-Schrift</a> typeface, used on <a href="Vehicle_registration_plates_of_Germany" title="Vehicle registration plates of Germany">German car license plates</a>, the zero is rectangular and has an "insinuated" slash: a diagonal crack just beneath the top right curve.

</p>

<div class="mw-heading mw-heading2"><h2 id="Typefaces">Typefaces</h2></div>

<p><a href="Typeface" title="Typeface">Typefaces</a> commonly found on <a href="Personal_computers" class="mw-redirect" title="Personal computers">personal computers</a> that use the slashed zero include:

</p>

<ul><li><a href="Terminal_(typeface)" title="Terminal (typeface)">Terminal</a> in <a href="Microsoft" title="Microsoft">Microsoft</a>'s <a href="Windows" class="mw-redirect" title="Windows">Windows</a> line.</li>

<li><a href="Consolas" title="Consolas">Consolas</a> in <a href="Microsoft" title="Microsoft">Microsoft</a>'s <a href="Windows_Vista" title="Windows Vista">Windows Vista</a>, <a href="Windows_7" title="Windows 7">Windows 7</a>, <a href="Microsoft_Office_2007" title="Microsoft Office 2007">Microsoft Office 2007</a> and <a href="Visual_Studio" title="Visual Studio">Microsoft Visual Studio 2010</a></li>

<li><a href="Menlo_(typeface)" title="Menlo (typeface)">Menlo</a> in <a href="MacOS" title="MacOS">macOS</a></li>

<li><a href="Monaco_(typeface)" title="Monaco (typeface)">Monaco</a> in <a href="MacOS" title="MacOS">macOS</a></li>

<li><a href="San_Francisco_(sans-serif_typeface)" title="San Francisco (sans-serif typeface)">SF Mono</a> in <a href="MacOS" title="MacOS">macOS</a><sup id="cite_ref-AppleInc-c2017-fonts_13-0" class="reference"><a href="#cite_note-AppleInc-c2017-fonts-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Nowell-67681-DsgnrNws_14-0" class="reference"><a href="#cite_note-Nowell-67681-DsgnrNws-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup></li>

<li>The <a href="Fedora_(operating_system)" class="mw-redirect" title="Fedora (operating system)">Fedora</a> Linux distribution ships with a tweaked variant of the Liberation typeface which adds a slash to the zero; this is not present on most other Linux distributions.</li>

<li><a href="ProFont" title="ProFont">ProFont</a></li>

<li><a href="Roboto" title="Roboto">Roboto</a> Mono</li></ul>

<p>Dotted zero typefaces:

</p>

<ul><li>The <a href="DejaVu_fonts" title="DejaVu fonts">DejaVu</a> family of typefaces has a "DejaVu Sans Mono" variant with a dotted zero.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup></li>

<li><a href="Andal%C3%A9_Mono" title="Andalé Mono">Andalé Mono</a> has a dotted zero.</li>

<li><a href="IBM_Plex" title="IBM Plex">IBM Plex Mono</a> uses a dotted zero.</li>

<li><a href="Source_Code_Pro" title="Source Code Pro">Source Code Pro</a> and its associated typefaces use a dotted zero.</li>

<li><a href="Cascadia_Code" title="Cascadia Code">Cascadia Code</a>, the default font for <a href="Windows_Terminal" title="Windows Terminal">Windows Terminal</a>, <a href="Visual_Studio" title="Visual Studio">Visual Studio</a>, and <a href="Visual_Studio_Code" title="Visual Studio Code">Visual Studio Code</a>, uses a dotted zero.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup></li></ul>

<div class="mw-heading mw-heading2"><h2 id="Variations">Variations</h2></div>

<div class="mw-heading mw-heading3"><h3 id="Dotted_zero">Dotted zero</h3></div>

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<p>The zero with a <a href="Dot_(diacritic)" title="Dot (diacritic)">dot</a> in the center seems to have originated as an option on <a href="IBM_3270" title="IBM 3270">IBM 3270</a> display controllers. The dotted zero may appear similar to the <a href="Greek_alphabet" title="Greek alphabet">Greek letter</a> <a href="Theta" title="Theta">theta</a> (particularly capital theta, Θ), but the two have different <a href="Glyphs" class="mw-redirect" title="Glyphs">glyphs</a>. In <a href="Raster_graphics" title="Raster graphics">raster</a> fonts, the theta usually has a horizontal line connecting, or nearly touching, the sides of an O, while the dotted zero simply has a dot in the middle. However, on a low-definition display, such a form can be confused with a numeral 8. In some fonts the IPA letter for a <a href="Bilabial_click" title="Bilabial click">bilabial click</a> (ʘ) looks similar to the dotted zero.

</p><p>Alternatively, the dot can become a vertical trace—for example, by adding a "combining short vertical line overlay" <code>(U+20D3)</code>. It may be coded as <code>0&#x20D3;</code> giving <span style="font-family:Code2000" class="Unicode">0⃓</span>.

</p><p>The dotted zero has been used on the <a href="Vehicle_registration_plates_of_Slovakia" title="Vehicle registration plates of Slovakia">vehicle registration plates of Slovakia</a> since 2023.<sup id="cite_ref-sampleSlovakLicencePlates_17-0" class="reference"><a href="#cite_note-sampleSlovakLicencePlates-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup>

</p>

<div class="mw-heading mw-heading3"><h3 id="Slashed_letter_'O'">Slashed letter 'O'</h3></div>

<p><a href="IBM" title="IBM">IBM</a> (and a few other early mainframe makers) used a convention in which the letter O had a slash and the digit 0 did not.<sup id="cite_ref-Dartmouth-1964-10-01-BASIC_18-0" class="reference"><a href="#cite_note-Dartmouth-1964-10-01-BASIC-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> This is even more problematic for <a href="Danish_people" class="mw-redirect" title="Danish people">Danes</a>, <a href="Faroese_people" class="mw-redirect" title="Faroese people">Faroese</a>, and <a href="Norwegian_people" class="mw-redirect" title="Norwegian people">Norwegians</a> because it means two of their letters — the O and slashed O (<a href="%C3%98" title="Ø">Ø</a>) — are visually similar.

</p><p>This was later flipped and most mainframe chain or band printers used the opposite convention (letter O printed as is, and digit zero printed with a slash). This was the de facto standard from 1970s to 1990s. However current use of network laser printers that use PC style fonts caused the demise of the slashed zero in most companies — only a few configured laser printers to use it.

</p>

<div class="mw-heading mw-heading3"><h3 id="Combining_solidus">Combining solidus</h3></div>

<p>Before <a href="Unicode" title="Unicode">Unicode</a> standardized the slashed variation of zero (0︀) seen above, it did allow <a href="Unicode#Ready-made_versus_composite_characters" title="Unicode">composite characters</a> which were used historically to obtain a crude <a href="Typographic_approximation" title="Typographic approximation">typographic approximation</a> where a slash is drawn upon a zero. It is treated literally as "a zero that is slashed", and it is <a href="Character_encoding" title="Character encoding">coded</a> as two characters: a standard zero <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base,#202122); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">0</span> followed by either "combining short solidus overlay" <span class="monospaced">U+0337</span> or "combining long solidus overlay" <span class="monospaced">U+0338</span>. However, besides confusing the meaning of the digit zero, it will make a mess if the zero is already slashed in the font. There is no way to specify an unslashed zero that can always be safely overprinted. Laying a slash over letter O also risks wrong appearance and confusion.

</p><p>For example, placing the "long solidus", which may be written in <a href="HTML" title="HTML">HTML</a> as <code class="mw-highlight mw-highlight-lang-text mw-content-ltr" style="" dir="ltr">0&#x338;</code>, appears as <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base,#202122); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">0̸</span>. Using the "short solidus overlay" <span class="monospaced">U+0337</span> after a standard zero character is coded as <code class="mw-highlight mw-highlight-lang-text mw-content-ltr" style="" dir="ltr">0&#x337;</code> and produces the following: <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base,#202122); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">0̷</span>.

</p>

<caption>The obsolete and wrong way

</caption>

<th>Method</th>

<th>Glyph</th>

<th>Notes

</th></tr>

<tr>

<td>Zero, Combining short solidus overlay</td>

<td>Do not do this, use 0︀ instead

</td></tr>

<tr>

<td>Zero, Combining long solidus overlay</td>

<td>Do not do this

</td></tr>

<tr>

<td>Letter 'o', short solidus</td>

<td>Do not do this, could be confused for <a href="%C3%98" title="Ø">ø</a> or <a href="Diameter#Symbol" title="Diameter">⌀</a>

</td></tr>

<tr>

<td>Letter 'O', long solidus</td>

<td>Do not do this, could be confused for <a href="%C3%98" title="Ø">Ø</a> or <a href="Empty_set" title="Empty set">∅</a>

</td></tr></tbody></table>

<div class="mw-heading mw-heading3"><h3 id="Reversed_slash">Reversed slash</h3></div>

<p>Some <a href="Burroughs_Corporation" title="Burroughs Corporation">Burroughs</a>/<a href="Unisys" title="Unisys">Unisys</a> equipment displays a zero with a reversed slash, similar to the <a href="No_symbol" title="No symbol">no symbol</a>, <span class="nounderlines" style="border: 1px solid var(--border-color-muted,#ddd); color: var(--color-base,#202122); background-color: var( --background-color-neutral-subtle, #fdfdfd); padding: 1px 1px;">🛇</span>, as does the free typeface <a href="Atkinson_Hyperlegible" title="Atkinson Hyperlegible">Atkinson Hyperlegible</a>.

</p>

<ul><li><a href="0_(number)" class="mw-redirect" title="0 (number)">0 (number)</a></li>

<li><a href="Symbols_for_zero" title="Symbols for zero">Symbols for zero</a> – Symbol representing the number or digit 0</li>

<li><a href="Names_for_the_number_0_in_English" title="Names for the number 0 in English">Names for the number 0 in English</a></li>

<li><a href="Arabic_numeral_variations#Slashed_zero" title="Arabic numeral variations">Arabic numeral variations#Slashed zero</a></li>

<li><a href="Regional_handwriting_variation#Arabic_numerals" title="Regional handwriting variation">Regional handwriting variation#Arabic numerals</a></li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite class="citation book cs1"><i>Reference Data for Radio Engineers</i> (Fifth ed.). Howard W. Sams & Co. Inc. 1970. pp. <span class="nowrap">30–</span>38. Table 23.</cite></span>

</li>

<cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.worldlicenseplates.com/world/PA_NZEA.html">"PA NZEA"</a>. <i>World License Plates (worldlicenseplates.com)</i>.</cite></span>

</li>

<li id="cite_note-FOOTNOTECajori192851-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-FOOTNOTECajori192851_3-0">^</a></b></span> <span class="reference-text"><a href="#CITEREFCajori1928">Cajori 1928</a>, p. 51.</span>

</li>

<cite class="citation magazine cs1">"Teletype Printing Telegraph Systems, Keytops, and Typepallets". Bulletin 1164 B. April 1958. pp. <span class="nowrap">1–</span>6. <q>Teletype part number 99564 (keytop).</q></cite> <span class="cs1-visible-error citation-comment"><code class="cs1-code">{{cite magazine}}</code>: </span><span class="cs1-visible-error citation-comment">Cite magazine requires <code class="cs1-code">|magazine=</code> (help)</span></span>

</li>

<cite class="citation magazine cs1">"Teletype Parts Bulletin". Bulletin 1184 B. pp. <span class="nowrap">27–</span>29. figure 29-31.</cite> <span class="cs1-visible-error citation-comment"><code class="cs1-code">{{cite magazine}}</code>: </span><span class="cs1-visible-error citation-comment">Cite magazine requires <code class="cs1-code">|magazine=</code> (help)</span></span>

</li>

<cite id="CITEREFAdam_Greenfield2013" class="citation web cs1">Adam Greenfield (13 April 2013). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20130413043945/http://www.metafilter.com/25220/That-gentle-piano-is-the-peace-of-the-grave">"That gentle piano is the peace of the grave"</a>. post 476182. Archived from <a rel="nofollow" class="external text" href="http://www.metafilter.com/25220/That-gentle-piano-is-the-peace-of-the-grave#476182">the original</a> on 13 April 2013.</cite></span>

</li>

<li id="cite_note-unicodevariants-7"><span class="mw-cite-backlink">^ <a href="#cite_ref-unicodevariants_7-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-unicodevariants_7-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://unicode.org/Public/UNIDATA/StandardizedVariants.txt">"Standardized Variants"</a>. Unicode, Inc. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20161221025841/http://www.unicode.org/Public/UNIDATA/StandardizedVariants.txt">Archived</a> from the original on 21 December 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">1 March</span> 2017</span>.</cite></span>

</li>

<li id="cite_note-emptyset-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-emptyset_8-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFBeetonFreytagIancuSargent" class="citation web cs1">Beeton, Barbara; Freytag, Asmus; Iancu, Laurențiu; Sargent, Murray. <a rel="nofollow" class="external text" href="http://www.unicode.org/L2/L2015/15268-slashed-zero.pdf">"Proposal to Represent the Slashed Zero Variant of Empty Set"</a> <span class="cs1-format">(PDF)</span><span class="reference-accessdate">. Retrieved <span class="nowrap">23 January</span> 2025</span>.</cite></span>

</li>

<li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.mozilla.org/en-US/docs/Web/CSS/font-variant-numeric">"font-variant-numeric"</a>. <i>MDN Web Docs</i><span class="reference-accessdate">. Retrieved <span class="nowrap">21 February</span> 2025</span>.</cite></span>

</li>

<li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.mozilla.org/en-US/docs/Web/CSS/font-feature-settings">"font-feature-settings"</a>. <i>MDN Web Docs</i><span class="reference-accessdate">. Retrieved <span class="nowrap">21 February</span> 2025</span>.</cite></span>

</li>

<li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://learn.microsoft.com/en-us/typography/opentype/spec/features_uz">"Registered Features: Descriptions and Implementations (u – z)"</a>. <i>Microsoft Learn</i><span class="reference-accessdate">. Retrieved <span class="nowrap">21 February</span> 2025</span>.</cite></span>

</li>

<cite id="CITEREFBemer1967" class="citation journal cs1"><a href="Robert_William_Bemer" class="mw-redirect" title="Robert William Bemer">Bemer, Robert William</a> (August 1967). "Towards standards for handwritten zero and oh: Much ado about nothing (and a letter), or a partial dossier on distinguishing between handwritten zero and oh". <i>Communications of the ACM</i>. <b>10</b> (8): <span class="nowrap">513–</span>518. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1145%2F363534.363563">10.1145/363534.363563</a>. <a href="S2CID_(identifier)" class="mw-redirect" title="S2CID (identifier)">S2CID</a> <a rel="nofollow" class="external text" href="https://api.semanticscholar.org/CorpusID:294510">294510</a>.</cite></span>

</li>

<cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.apple.com/fonts/">"Fonts"</a>. <i>Apple Developer (developer.apple.com)</i>. Apple Inc. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170508162049/https://developer.apple.com/fonts/">Archived</a> from the original on 8 May 2017<span class="reference-accessdate">. Retrieved <span class="nowrap">14 May</span> 2017</span>.</cite></span>

</li>

<cite id="CITEREFNowell" class="citation news cs1">Nowell, Peter. <a rel="nofollow" class="external text" href="https://www.designernews.co/stories/67681-apple-reveals-san-francisco-monospaced-font">"Apple Reveals San Francisco Monospaced Font"</a>. <i>Designer News (designernews.co)</i>. story 67681. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20161019003838/https://www.designernews.co/stories/67681-apple-reveals-san-francisco-monospaced-font">Archived</a> from the original on 19 October 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">14 May</span> 2017</span>.</cite></span>

</li>

<li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><cite id="CITEREFTuck2010" class="citation web cs1">Tuck, Michael (3 August 2010). <a rel="nofollow" class="external text" href="http://sixrevisions.com/web_design/a-web-designers-guide-to-linux-fonts/">"A Web Designer's Guide to Linux Fonts"</a>. <i>Six Revisions</i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20120616171124/http://sixrevisions.com/web_design/a-web-designers-guide-to-linux-fonts/">Archived</a> from the original on 16 June 2012.</cite></span>

</li>

<li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/microsoft/cascadia-code/blob/main/images/cascadia-code-characters.png">"Cascadia Code character set"</a>. <i><a href="GitHub" title="GitHub">GitHub</a></i>.</cite></span>

</li>

<li id="cite_note-sampleSlovakLicencePlates-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-sampleSlovakLicencePlates_17-0">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external autonumber" href="https://www.minv.sk/?vzory-tabuliek-s-evidencnym-cislom-pridelovane-na-vozidla">[1]</a> Official templates of Slovak license plates (in Slovak)</span>

</li>

An "archaic" software document from October 1964 showing many examples of the then-prevalent slashed-zero notation in the coding examples.

<cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/dartmouth/BASIC_Oct64.pdf">"BASIC <span style="color:gray">[computer programming language]</span>"</a> <span class="cs1-format">(PDF)</span>. Computation Center. <i>bitsavers.org</i>. <a href="Dartmouth_College" title="Dartmouth College">Dartmouth College</a>. 1 October 1964. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160118030822/http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/dartmouth/BASIC_Oct64.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 18 January 2016<span class="reference-accessdate">. Retrieved <span class="nowrap">17 August</span> 2021</span>.</cite></span>

</li>

</ol></div>

<div class="mw-heading mw-heading2"><h2 id="Sources">Sources</h2></div>

<ul><li><cite id="CITEREFCajori1928" class="citation cs2"><a href="Florian_Cajori" title="Florian Cajori">Cajori, Florian</a> (1928), <i>A History of Mathematical Notations</i>, Chicago, IL: Open Court Pub.</cite>; <cite class="citation cs2"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://archive.org/details/historyofmathema00cajo_0"><i>op. cit.</i></a></span>, New York: Dover Publications, 1993, <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>0-486-67766-4</bdi></cite>.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

<ul><li><cite class="citation cs2"><a rel="nofollow" class="external text" href="http://www.catb.org/~esr/jargon/html/0/numeral-zero.html">"0"</a>, <i>The Jargon File</i>, Eric S Raymond</cite>.</li>

<li><a rel="nofollow" class="external text" href="http://2.bp.blogspot.com/_VfTYpLOGZ3w/Sx7Qq2NSF1I/AAAAAAAAEpo/0wyq40rXrzY/s1600-h/1.jpg">Underground Zerø Album Cover</a> Underground Zerø Band Logo</li></ul></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-07-12" href="https://en.wikipedia.org/wiki/?title=Slashed_zero&oldid=1300192050">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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