U+2140 "⅀" Double-Struck N-Ary Summation Unicode Character
Unicode Version 17.0
U+2140 "⅀" Double-Struck N-Ary Summation is a typographic variant of the standard summation symbol (Σ) used in mathematical notation, rendered in a blackboard bold or double-struck style to indicate a sum over a set of numbers in contexts where a distinct visual emphasis is needed. Unlike the ordinary Greek capital letter sigma used for summation, this character is specifically encoded as a separate double-struck glyph, often appearing in academic or typeset documents to represent a summation operator with a more formal or decorative appearance, particularly in disciplines like algebra or number theory where notation clarity is paramount. It belongs to the Letterlike Symbols block in Unicode and is distinct from both the regular summation sign and other similar double-struck characters, serving as a specialized tool for mathematicians and typographers.
General Properties
Encodings
| HTML Decimal Encoding |
⅀ |
| HTML Hex Encoding |
⅀ |
| UTF-8 Encoding |
0xE2 0x85 0x80 |
| UTF-16 Encoding |
0x2140 |
| UTF-32 Encoding |
0x00002140 |
| C/C++/Java Escape |
\u2140 |
Unicode Properties