Using your example, the Delta Nu chapter of Sigma Sigma Sigma might be at State University, whereas the Delta Xi chapter of Sigma Sigma Sigma might be at State Tech. The national group (Sigma Sigma Sigma) is broken down into university-tied groups (chapters). This is the case for all national sororities. The chapter name designates the university with which the national sorority is affiliated.
(I was never a Rho Chi and boy am I glad! It's hard to define chapter!)
Some sororities have two letters because that's what their founders chose. Others have three letters because, you guessed it, that's what their founders chose.
Are you a PNM? A new member somewhere? (Just asking because of the Greek letters in your username.)
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Never let the facts stand in the way of a good answer. -Tom Magliozzi
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