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# sigma

noun (sigma, sigmas); adjective (sigma — slang)

«sigma» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. The eighteenth letter of the Greek alphabet, written Σ (capital) and σ or ς (small). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#m1)
2. (maths) The capital Σ means "add up all of these" (the sum); small σ is used in statistics for standard deviation (how spread out numbers are). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#m2)
3. (slang, internet) Used by some young people to mean "cool", "independent" or "the best", as in "sigma male"; often a joke or meme. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#m3)

### In the lessons

In maths, Σ appears in sums: Σ of 1 to 4 means 1 + 2 + 3 + 4 = 10. In science, Greek letters name many things. In playground and internet slang, "sigma" is a meme word for someone who goes their own way; teachers and parents often find it silly. Phrases: sigma notation, sigma male (slang), "that's so sigma" (slang).

### Examples

- Σ is the Greek capital letter sigma. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#x1)
- In maths, Σ means "add them all up". [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#x2)
- The sum Σ from 1 to 5 equals 15. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#x3)
- "He didn't care what anyone thought — so sigma," joked my brother. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#x4)
- Small sigma σ is used to show spread in statistics. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#x5)
- In Greek, sigma makes an "s" sound. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/#x6)

### Note

Sounds like "SIG-muh". Greek sigma = English "s". The slang meaning comes from online videos; using it seriously can sound silly, and "sigma male" ideas are not science.

## On Mova

- [Trees and pragmatics of «sigma» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/sigma/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«sigma» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/sigma.html) on Mova free.