“Sigma” can refer to;
1. A United Kingdom-based Drum and Bass collective
2. An Arizona, USA based punk-rock band
3. One of the many pseudonyms of Canadian electronic artist Renard.
4. A Psy-Trance artist from Ramat-Gan, Israel
5. A boy group from Taiwan (SIGMA乐团).
6. A Greek rapper.

—
1. Sigma (Σ) is a British drum and bass duo consisting of Cameron Edwards and Joe Lenzie. They met at Leeds University at drum and bass nights. Their 2010 collaboration with DJ Fresh “Lassitude” peaked at number 98 on the UK Singles Chart.