This is because most fraternities and sororities are named after a series of Greek letters, such as Alpha Delta Pi or Sigma Phi.

VOA: special.2009.09.25

Sigma Phi Epsilon has taken on a new agenda, and it goes by the name of Balanced Man.

NPR: From Togas to Yoga: Fraternities Try to Alter Image

Sigma Phi Epsilon isn't the only one trying the "classy frat guy" style.

NPR: From Togas to Yoga: Fraternities Try to Alter Image

Over at George Washington University's Sigma Phi Epsilon chapter, the brothers are on the basement floor, concentrating on their breathing.

NPR: From Togas to Yoga: Fraternities Try to Alter Image