Sigma
Sigma (Σ, σ, ς; grieķu: σίγμα) ir grieķu alfabēta 18. burts. Grieķu alfabēta skaitļu pieraksta sistēmā, tam ir nozīme 200. Cēlies no feniķiešu burta 
— sins. No burta "sigma" cēlies latīņu alfabēta burts S un Kirilicas alfabēta C.
Pielietojums
Lielo burtu Σ kā simbolu izmanto, lai apzīmētu:
- Matemātikā — summu.
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