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Diameter sign
U+2300 · Miscellaneous Technical
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Meaning and uses
The diameter sign, a circle crossed by a slanted line. On technical drawings it goes before a size to show that the size is a diameter, as in ⌀12 mm for a 12 mm hole or shaft. The letter Ø and the empty set sign ∅ look much the same and often stand in for it because they are easier to type: Ø has the Windows Alt code 0216 and the Mac keys Option+Shift+O. In AutoCAD text, the control code %%c draws the diameter symbol.
Unicode details
| Unicode name | DIAMETER SIGN |
|---|---|
| Code point | U+2300 |
| Block | Miscellaneous Technical |
| Added | Unicode 1.1 (1993) |
| Category | Symbol (So) |
| Emoji | No |
| UTF-8 bytes | E2 8C 80 |
| UTF-16 | 2300 |
| HTML | ⌀ |
Tap a code to copy it:
How to type ⌀
- Mac: Fn+E opens the Character Viewer; search “diameter sign”.
- Word: 2300, then Alt+X.
- Excel and Google Sheets:
=UNICHAR(8960). - AutoCAD text:
%%c. - Phone: copy it from this page.
- Linux (GNOME): Ctrl+Shift+U, then 2300, then Space.
- HTML:
⌀. CSScontent:"\2300".