# ⅀ U+2140 DOUBLE-STRUCK N-ARY SUMMATION

Double-struck blackboard bold sigma, a summation symbol used in mathematical notation.

| | |
|---|---|
| Character | `⅀` |
| Codepoint | U+2140 |
| Name | DOUBLE-STRUCK N-ARY SUMMATION |
| Block | [Letterlike Symbols](https://unicodekit.com/block/letterlike-symbols) |
| Script | Common |
| Category | Math Symbol (Sm) |
| Unicode version | 3.2 |
| HTML | `⅀` `⅀` |
| CSS | `\2140` |
| JavaScript | `\u2140` |
| UTF-8 | E2 85 80 |
| UTF-16 | 2140 |
| Decomposition | font U+2211 |

## Related characters

- ℿ [U+213F DOUBLE-STRUCK CAPITAL PI](https://unicodekit.com/char/213F)
- ⅁ [U+2141 TURNED SANS-SERIF CAPITAL G](https://unicodekit.com/char/2141)
- ℾ [U+213E DOUBLE-STRUCK CAPITAL GAMMA](https://unicodekit.com/char/213E)
- ⅂ [U+2142 TURNED SANS-SERIF CAPITAL L](https://unicodekit.com/char/2142)
- ℽ [U+213D DOUBLE-STRUCK SMALL GAMMA](https://unicodekit.com/char/213D)
- ⅃ [U+2143 REVERSED SANS-SERIF CAPITAL L](https://unicodekit.com/char/2143)
- ℼ [U+213C DOUBLE-STRUCK SMALL PI](https://unicodekit.com/char/213C)
- ⅄ [U+2144 TURNED SANS-SERIF CAPITAL Y](https://unicodekit.com/char/2144)
- ℻ [U+213B FACSIMILE SIGN](https://unicodekit.com/char/213B)
- ⅅ [U+2145 DOUBLE-STRUCK ITALIC CAPITAL D](https://unicodekit.com/char/2145)
- ℺ [U+213A ROTATED CAPITAL Q](https://unicodekit.com/char/213A)
- ⅆ [U+2146 DOUBLE-STRUCK ITALIC SMALL D](https://unicodekit.com/char/2146)

Page: https://unicodekit.com/char/2140 · JSON: https://unicodekit.com/characters/2140