Sigma is the upper case letter S in Greek. And S stands for S um. I love Sigma, it is fun to use, and can do many clever things. So means to sum things up ... Sum whatever is after the Sigma:

The Greek letter σ (sigma) is used in statistics to represent the standard deviation of a population. It also has various uses in other areas of math and science.

In number theory, σ is included in various divisor functions, especially the sigma function or sum-of-divisors function. In applied mathematics, σ (T) denotes the spectrum of a linear map T.

Sigma notation (which is also known as summation notation) is the easiest way of writing a smaller or longer sum using the sigma symbol ∑, the general formula of the terms, and the index.

Learn about the Greek letter Sigma (σ), its pronunciation, usage examples, and common applications in mathematics, science, and engineering.

The symbol Σ (capital sigma) is often used as shorthand notation to indicate the sum of a number of similar terms. Sigma notation is used extensively in statistics.

Sigma (uppercase Σ, lowercase σ) is the 18th letter of the Modern Greek alphabet. In Gematria it has the value of 200. The alternative form of sigma (ς) must be used in word-final position. …

Sigma (Σ, σ) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200. In general mathematics, uppercase Σ is used as an operator for …

Σ is called the summation symbol or uppercase sigma. In sigma notation, it tells you to sum values given by a function or formula over a defined range, such as all terms from k = 1 to k = n.

Dec 21, 2025 · The sigma symbol (Σ) in mathematics represents summation, a process of adding a sequence of numbers or expressions. It has roots in ancient Greek civilization , originating …