N-ary Summation
Part of Math Symbols
N-ary Summation has no standard Windows Alt code. Copy the character directly, or use its HTML entity or Unicode value instead.
- Alt code
- None
- HTML entity
- ∑
- Unicode
- U+2211
About this symbol
The capital Greek letter sigma, for sum, was introduced as a summation sign by Leonhard Euler in his Institutiones calculi differentialis of 1755. Joseph-Louis Lagrange took it up in 1772, and in 1820 Joseph Fourier added the limits above and below the sigma, the earliest use of the sign for a sum between two definite end points. Unicode keeps it as a separate character from the Greek letter Σ so that mathematical text can be told apart from Greek.
Unicode facts
- Official name
- N-ARY SUMMATION
- Also called
- Summation sign
- Type
- Maths symbol
- Unicode block
- Mathematical Operators
- Unicode group
- N-ary operators
- Added in
- Unicode 1.1 (1993)
Click the symbol or any value at the top of the page to copy it. See the full Math Symbols chart for related characters.