Unicode Character "∅" (U+2205)

The character (Empty Set) is represented by the Unicode codepoint U+2205. It is encoded in the Mathematical Operators block, which belongs to the Basic Multilingual Plane. It was added to Unicode in version 1.1 (June, 1993). It is HTML encoded as ∅.

Main Unicode Properties

Name Empty Set
Unicode Codepoint U+2205
Unicode Version 1.1 (June, 1993)
Block Mathematical Operators
Plane Basic Multilingual Plane

Bidirectional Data

Bidirectional class Other Neutral (ON)
Is mirrored? No

Other Unicode Data

Category Math Symbol
Script Code for undetermined script
Combining Class Not Reordered

U+2205 Conversion

HTML (decimal) ∅
HTML (hex) ∅
HTML (named) ∅
URL Escape Code %E2%88%85
CSS \002205
JavaScript, JSON \u2205
C, C++, Java \u2205
Python \u2205
Rust \u{2205}
Ruby \u2205

How to type "∅"

  • Windows ?: Hold Alt, then type 2 2 0 5. Release Alt.
  • Mac ?: Hold Alt ⌥, then type 2 2 0 5. Release Alt.


  • Times, Times New Roman, serif
  • Helvetica, Arial, sans-serif
  • Courier, Courier New, monospace

UTF Encodings

UTF-8 (hex) 0xE2 0x88 0x85
UTF-16 (hex) 0x2205
UTF-32 (hex) 0x00002205