U+03C3 "σ" Greek Small Letter Sigma Unicode Character

U+03C3 "σ" Greek Small Letter Sigma is the lower case form of the eighteenth letter in the Greek alphabet and it is used extensively in modern and ancient Greek writing to represent the /s/ sound. In mathematics and science, it is most famously employed to denote summation in sigma notation, as well as standard deviation in statistics and electrical conductivity in physics. This character possesses a unique contextual variation in its native Greek typography, where it appears as a different glyph, the final sigma "ς", when it occurs at the end of a word, though Unicode encodes this variant separately as U+03C2.