Findings:
- Phi Kappa Sigma
- Phi Delta Sigma
- σ algebra
- Sigma (user)
- Sigma field
- Sigma Xi
- Sigma Alpha Epsilon
- sigma finite
- Six Sigma
- Sigma EM8500
- Sigma Alpha Mu
- Sigma Kappa
- sigma factor
- Sigma Star Saga
- sigma sigma sigma
- sigma algebra
- Alpha Chi Sigma
- sigma curve
- sigma male
- 7th Sigma
- Sigma Draconis
- Lunated
- Kappa Sigma
- sigma
- Σ
- Sigma Nu
- Lunate
- Sigma Phi Epsilon
- sigma notation
- Sigma Designs
- Plateau Sigma
- Sigma Mu Beta
- Korg Sigma
- Tau Beta Sigma
- Sigma Chi
- sigma function
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