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Empty set
U+2205 · Mathematical Operators
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Meaning and uses
The empty set sign, a circle with a slash. In maths it means a set with nothing in it. It is a different character from the letter Ø and the diameter sign ⌀.
Unicode details
∅ is the Unicode character named EMPTY SET, code point U+2205, in the Mathematical Operators block. It was added in Unicode 1.1 in 1993, and Unicode classes it as a maths symbol (general category Sm).
It is not an emoji, so it keeps the colour and size of the text around it.
| Unicode name | EMPTY SET |
|---|---|
| Code point | U+2205 |
| Block | Mathematical Operators |
| Added | Unicode 1.1 (1993) |
| UTF-8 bytes | E2 88 85 |
| UTF-16 | 2205 |
| HTML | ∅ or ∅ |
Tap a code to copy it:
How to type ∅
- On any device, tap the copy button above, then paste with a long press on a phone, Ctrl+V on Windows or Cmd+V on a Mac.
- In Microsoft Word on Windows, type 2205 and then press Alt+X to turn the code into ∅.
- On a Mac, press Control+Cmd+Space to open the Character Viewer, then search for “empty set”.
- On Linux, most desktops accept Ctrl+Shift+U, then 2205, then Space or Enter.
- In HTML, use
∅or∅. In a CSScontentproperty, use"\2205".