How to Type a Slashed Zero (0̷ or Ø) on a Keyboard

Depends on which slashed zero you need — here’s every method

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A slashed zero — a zero with a diagonal line through it — appears in several distinct contexts, and which character you actually need depends on what you’re using it for.

There are multiple different characters that look like a slashed zero, and they’re not interchangeable. Here’s how to identify which one you need and how to type it on every platform.

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Which Slashed Zero Do You Actually Need?

Ø — the Latin letter O with stroke (U+00D8), uppercase. A letter in Danish, Norwegian, Faroese, and some other languages. Also used as a symbol in mathematics and engineering for diameter. This is a letter, not a zero.

ø — lowercase version (U+00F8). Same linguistic and technical uses as the uppercase.

0̷ — a regular zero (U+0030) combined with a combining long stroke overlay (U+0338). Creates the appearance of a slashed zero using two Unicode characters. Works in many fonts and contexts.

⌀ — the diameter sign (U+2300). A circle with a horizontal stroke, used specifically in engineering and technical drawings to indicate diameter measurements.

0 with a slash in a specific font — some fonts like Consolas, Courier New, and many programming fonts render the zero character with a built-in slash or dot to distinguish it from the letter O. This isn’t a special character — it’s just how those fonts render the regular zero.

For most people asking about a slashed zero, the answer is one of these three scenarios:

Programming and technical contexts — use a font that renders zeros with a slash built in.

Engineering and technical drawings — use ⌀ (the diameter sign, U+2300).

Scandinavian language writing — use Ø or ø (the O with stroke).

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Windows

Method 1: Alt Codes

For Ø (uppercase O with stroke): hold Alt and type 0216 on the numeric keypad.

For ø (lowercase o with stroke): hold Alt and type 0248 on the numeric keypad.

For ⌀ (diameter sign): hold Alt and type 8960 on the numeric keypad.

• Num Lock must be on
• Use the numeric keypad only

Method 2: Character Map

Search for Character Map in the Start menu. Find the character you need — search “slashed” or “stroke” or “diameter” — copy and paste.

Method 3: System-Wide Text Expansion

Use AutoHotkey or Espanso to map a trigger to your chosen character:

::/0::Ø
::dia::⌀

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Mac

Method 1: Keyboard Shortcut

For Ø: press Option + Shift + O.

For ø: press Option + O.

These are the methods to remember on Mac — logical because O is the base letter. Works in every application with no setup.

For ⌀ (diameter sign): use the Character Viewer — press Control + Command + Space and search “diameter.”

Method 2: Character Viewer

Press Control + Command + Space and search for “slashed zero,” “stroke,” or “diameter” depending on which character you need.

Method 3: Text Replacement

Go to System Settings → Keyboard → Text Replacements and map triggers like /0 or diam to the characters you use most.

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iPhone and iPad

Method 1: Long Press the O Key

Tap and hold the O key on the iOS keyboard. A popup appears with accented and variant versions of O — Ø appears as one of the options. Slide to it and release.

This is the built-in iOS method and requires no setup. Works for Ø and ø immediately.

Method 2: Text Replacement

Go to Settings → General → Keyboard → Text Replacement and add your preferred slashed zero character with a trigger like /0 or diam.

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Android

Method 1: Long Press the O Key

On Gboard and most Android keyboards, tap and hold the O key. Ø appears as a long-press variant. Slide to it and release.

Method 2: Gboard Symbol Search

In Gboard, tap the G logo and search “diameter” or “stroke” to find the relevant characters.

Method 3: Add Scandinavian Keyboard

In Gboard settings, add Danish or Norwegian as a keyboard language. Ø is a primary key on these layouts.

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Chromebook

Method 1: Unicode Input

For Ø: press Ctrl + Shift + U, type 00d8, press Enter. For ø: press Ctrl + Shift + U, type 00f8, press Enter. For ⌀: press Ctrl + Shift + U, type 2300, press Enter.

Method 2: Add Scandinavian Input Method

Go to Settings → Device → Keyboard → Input Methods and add Danish or Norwegian for direct Ø key access.

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Linux

Method 1: Unicode Input

For Ø: press Ctrl + Shift + U, type 00d8, press Enter. For ø: press Ctrl + Shift + U, type 00f8, press Enter. For ⌀: press Ctrl + Shift + U, type 2300, press Enter.

Method 2: Compose Key

With a Compose key configured:

Compose + / + O produces Ø. Compose + / + o produces ø.

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Microsoft Word (Any Platform)

Method 1: Alt + X

For Ø: type 00D8 then press Alt + X. For ø: type 00F8 then press Alt + X. For ⌀: type 2300 then press Alt + X.

Method 2: Insert Symbol With AutoCorrect

Go to Insert → Symbol → More Symbols. Find the character, insert it, and set up an AutoCorrect trigger like /O for Ø or dia for ⌀.

Method 3: Alt Codes

Alt + 0216 for Ø, Alt + 0248 for ø, Alt + 8960 for ⌀.

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Google Docs

Option + Shift + O on Mac works in Google Docs for Ø. Alt codes work on Windows.

Go to Insert → Special Characters and search “stroke” or “diameter” for any of the variants.

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LaTeX

latex

% O with stroke (Scandinavian letter)
\O          % uppercase Ø
\o          % lowercase ø

% Diameter sign in math
$\diameter$  % requires wasysym package
$\oslash$    % circle with diagonal slash (similar)
\usepackage{wasysym}
$\diameter$  % proper diameter symbol

% Zero with slash for disambiguation
% Most programming fonts handle this automatically
% For explicit slashed zero in text:
$0\hspace{-0.6em}/$  % approximate workaround

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HTML

html

<!-- O with stroke -->
&Oslash;    <!-- Ø uppercase -->
&oslash;    <!-- ø lowercase -->
&#216;      <!-- Ø decimal -->
&#248;      <!-- ø decimal -->

<!-- Diameter sign -->
&#8960;     <!-- ⌀ decimal -->
&#x2300;    <!-- ⌀ hex -->

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For Programming Fonts: No Special Character Needed

If you want slashed zeros in your code editor, you don’t need a special character at all — you need a font that renders the regular zero with a slash or dot to distinguish it from the letter O.

Fonts that render zero with a distinguishing mark:

With a diagonal slash: Consolas (Windows default), many terminal fonts

With a dot in the center: Fira Code, JetBrains Mono, Cascadia Code, Source Code Pro

With a dot below: Some variants of Courier

In your code editor settings, switch to one of these fonts and the regular zero key produces a visually distinguished zero automatically — no special character needed and no risk of introducing a non-standard character into your code.

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Quick Reference Table

Character	Platform	Method	Shortcut
Ø	Windows	Alt code	Alt + 0216
ø	Windows	Alt code	Alt + 0248
Ø	Mac	Keyboard shortcut	Option + Shift + O
ø	Mac	Keyboard shortcut	Option + O
Ø / ø	iPhone / iPad	Long press O key	Hold O, slide to Ø
Ø / ø	Android	Long press O key	Hold O, slide to Ø
Ø	Chromebook	Unicode input	Ctrl + Shift + U, 00d8
⌀	Chromebook	Unicode input	Ctrl + Shift + U, 2300
Ø	Word	Code conversion	Type 00D8 then Alt + X
⌀	Word	Code conversion	Type 2300 then Alt + X
Ø / ø	LaTeX	Commands	\O and \o

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The Bottom Line

The right slashed zero depends entirely on what you’re trying to express. For Scandinavian language writing or the diameter symbol in informal contexts, Ø is what you need — Option + Shift + O on Mac, Alt + 0216 on Windows, long press O on mobile. For engineering diameter notation, ⌀ (U+2300) is the correct technical symbol. For programming, just use a font that renders the regular zero with a built-in slash.

On Mac, Option + O and Option + Shift + O are the most natural shortcuts available — the O key is the obvious home for O-derived characters.

There’s no single slashed zero — there’s a Scandinavian letter, an engineering symbol, and a font rendering choice. Know which one you need and the method is straightforward.