FontsDiameter Symbol (⌀)
Tap Copy to get ⌀, or see how to type it on any device below.
- One-tap copy
- Windows, Mac, HTML
- Unicode name
DIAMETER SIGN
U+2300 · HTML ⌀ · in Unicode since 1.1 (1993)
Symbols often used with measurements
How to type ⌀ on any device
| Where | How |
|---|---|
| Windows | Press Windows + . (period), open Symbols and pick it. |
| Mac | Press Fn/Globe + E (or choose Edit > Emoji & Symbols) to open the Character Viewer, then search for diameter. |
| HTML | ⌀ or ⌀ |
| CSS | content: "\2300"; |
| Unicode | U+2300 DIAMETER SIGN |
| Linux (Compose key) | Compose d i |
| Phone or anywhere else | Tap the Copy button above and paste it. |
Lookalikes to avoid
These look similar but mean something else:
| Character | Unicode name | Code point | What it is for |
|---|---|---|---|
| Ø | LATIN CAPITAL LETTER O WITH STROKE | U+00D8 | LATIN CAPITAL LETTER O WITH STROKE, a letter of the Danish and Norwegian alphabets. |
| ø | LATIN SMALL LETTER O WITH STROKE | U+00F8 | LATIN SMALL LETTER O WITH STROKE, its lowercase form (Alt+0248 on Windows). |
| ∅ | EMPTY SET | U+2205 | EMPTY SET, the math symbol for a set with no elements. |
| ⊘ | CIRCLED DIVISION SLASH | U+2298 | CIRCLED DIVISION SLASH, a math operator. |
How the diameter sign is used
In technical drawings and specifications it goes before or after a number, as in ⌀ 55 mm. Photographic filter thread sizes are often written this way too.
Why ø shows up instead
⌀ has no Windows Alt code, so many people type the letter ø (Alt+0248), which looks close. It's a different character, so search and screen readers treat it as a letter.
Frequently asked questions
Is ⌀ the same as Ø?
No. ⌀ is DIAMETER SIGN (U+2300); Ø is a letter (U+00D8). Unicode's notes list them as lookalikes.
How do I type the diameter symbol?
Copy it from this page. On Windows, press Windows + . and look in the Symbols tab; on a Mac, search the Character Viewer for diameter; on Linux with a Compose key, Compose d i.
What's the HTML code for ⌀?
⌀ or ⌀.