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Sigma factor
List of Phi Sigma Sigma chapters
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Sigma coordinate system
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Sigma Chi
Histor–Sigma
SDS Sigma series
Delta-sigma modulation
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Sigma SA-mount
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Sigma DP1
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Sigma Rho
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Sigma Healthcare
Sigma (DJs)
Delta Sigma Theta
Sigma SD14
Sigma DP1s
Sigma Phi Sigma (professional)
Sigma Phi
Sigma Pi
Sigma Sigma Omicron
Kappa Sigma
Phi Sigma Kappa