sigma
- Noun. The name for the eighteenth letter of the Classical and Modern Greek, the nineteenth letter of Old and Ancient.
- Noun. (mathematics) The symbol '''Σ''', used to indicate summation of a set or series.
- Noun. (statistics) The symbol '''σ''', used to indicate one standard deviation from the mean, particularly in a normal distribution.
This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.