U+2300 · Other symbol
LaTeX
\diameter
Diameter Sign Symbol ⌀
⌀ is diameter sign, U+2300 — \diameter in LaTeX. It was added in Unicode 1.1, and Unicode files it under Other symbol.
Codes & technical data
| Unicode | U+2300 | |
|---|---|---|
| HTML hex | ⌀ | |
| HTML decimal | ⌀ | |
| CSS | \2300 | |
| JavaScript | \u{2300} | |
| Python | \U00002300 | |
| Java / C# | \u2300 | |
| Rust | \u{2300} | |
| Swift | \u{2300} | |
| PHP | \u{2300} | |
| URL encoded | %E2%8C%80 | |
| UTF-8 bytes | E2 8C 80 | |
| UTF-16 bytes | 2300 | |
| Base64 | 4oyA | |
| Decimal | 8960 | |
| LaTeX | \diameter | |
| Category | Other symbol (So) | |
| Introduced | Unicode 1.1 | |
Will ⌀ survive being pasted?
- Normalisation. Yes. ⌀ is unchanged by NFKC, so it survives normalising systems intact.
- Legacy encodings. ⌀ is Unicode-only — it has no Latin-1 equivalent, so a system stuck on an 8-bit encoding cannot represent it.
- Size. 3 bytes in UTF-8. Character-limited fields — SMS, bios, some form validators — usually count bytes, not characters.
Unicode cross-references
The standard points readers of ⌀ at these characters — usually because they look alike, or because one is the correct choice where the other is often used by mistake.
Nearby in Miscellaneous Technical
Symbols from engineering, electronics and computing: APL operators, keyboard keys, dentistry and cartography marks. The ⌘ ⌥ ⇧ ⏎ keys people paste into shortcut documentation live here.
How to type ⌀
| Windows | Type 2300 then press Alt+X |
|---|---|
| macOS | Press Ctrl+Cmd+Space, then search for “diameter sign” |
| Linux | Press Ctrl+Shift+U, type 2300, press Enter |
| HTML | ⌀ |
About Unicode’s Other symbol category
Unicode files this under "other symbol" — the catch-all for pictographs, signs and marks that are neither maths, currency, nor letter-like. It is the largest symbol category in the standard.
Frequently asked questions
- How do I type the ⌀ diameter sign symbol?
- On Windows, type 2300 and press Alt+X. On Linux press Ctrl+Shift+U then 2300. On any system the quickest route is the copy button on this page.
- What is the code for ⌀?
- Diameter Sign is U+2300 and in LaTeX as \diameter. In UTF-8 it takes 3 bytes. The table above lists every escape format.
- What kind of character is ⌀?
- Diameter Sign is filed under Other symbol in the Miscellaneous Technical block, and was introduced in Unicode 1.1. Unicode files this under "other symbol" — the catch-all for pictographs, signs and marks that are neither maths, currency, nor letter-like. It is the largest symbol category in the standard.