outline sigma Symbol set isolated on white background 13750420 Vector sigma icon vector from math symbols collection. Thin line sigma outline Sigma Anime Wallpapers Top Free Sigma Anime Backgrounds WallpaperAccess Sigma Will Increase Prices in the US on June 2 Because of Tariffs Common Mathematical Symbols: Definitions and Uses Civil Engineering QS Mathematical symbol icon sigma, vector illustration Stock Vector. A must have for members of Sigma Gamma Rho sorority, this Sisterhood t shirt is made of high quality cotton and features the iconic SGR logo. Perfect for wearing around campus or at events, this t shirt is sure to show your sorority pride.