Or even, what the sigma?! Confused about what it might mean, or why kids are so obsessed with saying it? Here’s a quick breakdown of where the word has come from... Sigma is the eighteenth letter of ...

Some know “sigma” as the 18th letter of the Greek alphabet but it’s also teen slang for a cool dude. According to Know Your ...

Foundation for Individual Rights and Expression (FIRE) sent a letter to University President Gregory Fenves on April 15 on ...