Background for sigma

sigma

/ˈsɪɡmə/

Illustration sigma - Image 1

noun

The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient.

Examples :

"In Greek class, we learned that sigma is the eighteenth letter of the alphabet. "

language writing sign

Illustration sigma - Image 1

noun

The symbol Σ, used to indicate summation of a set or series.

Examples :

"The math textbook explained how to use the sigma notation (Σ) to easily represent the sum of many numbers in a sequence. "

math number sign statistics

Illustration sigma - Image 1

noun

The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.

Examples :

"The teacher explained that a score one sigma above the mean in the math test meant the student performed better than most of the class. "

math statistics