U+2205
Empty set∅
Empty set is a monochrome text character from the Unicode Mathematical Operators block, listed here under Math and Checks & Crosses. Copy it with one click, or use the hex, octal, decimal and HTML entity codes below to embed it in web pages, code, and documents. It is often searched for as "null".
Quick facts
- Unicode
- U+2205
- Decimal
- 8709
- Hex
- 0x2205
- Octal
- 0o21005
Unicode identity
| Format | Value | Copy |
|---|---|---|
| Code pointOfficial Unicode notation | U+2205 | |
| Official nameUnicodeData.txt, Unicode 18.0.0 | EMPTY SET | |
| DecimalBase 10 | 8709 | |
| HexadecimalBase 16 | 0x2205 | |
| OctalBase 8 | 0o21005 | |
| BinaryBase 2 | 0010001000000101 | |
| General categorySymbol, math | Sm | |
| Unicode blockU+2200–U+22FF | Mathematical Operators | |
| Plane | Basic Multilingual Plane (BMP, Plane 0) |
HTML & CSS
| Format | Value | Copy |
|---|---|---|
| HTML entity (decimal) | ∅ | |
| HTML entity (hex) | ∅ | |
| HTML entity (named) | ∅ | |
| CSS content escapeUse inside content: "…" | \2205 | |
| URL encodedPercent-encoded UTF-8 | %E2%88%85 |
Programming languages
| Format | Value | Copy |
|---|---|---|
| JavaScript / TypeScript | \u2205 | |
| JSONUTF-16 surrogate pairs | \u2205 | |
| Python | \u2205 | |
| Java / C# / Kotlin | \u2205 |
Byte encodings
| Format | Value | Copy |
|---|---|---|
| UTF-83 bytes | E2 88 85 | |
| UTF-16 (BE) | 2205 | |
| UTF-32 (BE) | 00002205 |
How to type Empty set
Windows
Hold Alt and type +2205 with the hex numeric keypad option enabled, or type 2205 then press Alt+X in Word and most Office apps.
macOS
Enable the Unicode Hex Input keyboard, hold Option, and type 2205. Or open Character Viewer (Control+Command+Space) and search "Empty set".
Linux
Press Ctrl+Shift+U, type 2205, then press Space or Enter in GTK apps. IBus and most terminals support the same sequence.
HTML, CSS & code
Paste the character directly, or use the escapes above: ∅ in HTML, \2205 in CSS, and \u2205 in JavaScript.
Official Unicode reference
- Character name
- EMPTY SET
- Block
- Mathematical Operators (U+2200–U+22FF)
- General category
- Sm — Symbol, math
Data from the Unicode Character Database, version 18.0.0. See the official code chart for the Mathematical Operators block: U2200.pdf (PDF, unicode.org).
Frequently asked questions
How do I copy the Empty set symbol?
Click the Copy button at the top of this page, or select ∅ and press Ctrl+C (Cmd+C on Mac). It is plain Unicode text, so it pastes into documents, chats, code, and design tools.
What is the Unicode code point for Empty set?
Empty set is U+2205 (decimal 8709, hexadecimal 0x2205, octal 0o21005). It lives in the Mathematical Operators block (U+2200–U+22FF) of the Basic Multilingual Plane (BMP, Plane 0).
What is the official Unicode name of Empty set?
The Unicode Standard (version 18.0.0) names this character "EMPTY SET". Its General_Category is Sm (Symbol, math).
What is the HTML code for Empty set?
Use ∅ or ∅, or the named entity ∅. In CSS, use content: "\2205".
How do I type Empty set in code?
JavaScript: "\u2205". Python: "\u2205". JSON and Java: "\u2205". The UTF-8 byte sequence is E2 88 85.
Is Empty set an emoji?
No. Empty set is a text symbol and renders as a monochrome glyph in the current font. Some platforms may offer an emoji variant when U+FE0F is appended.