secret society

Last night the brothers of Phi Gamma Delta (better known as FIJI) hosted "Guidopalooza". Needless to say, the Jersey shore is a little misplaced in lower middle Tennessee.
But this really has to do with a conversation I had with a sorority sister by the name of Sarah Pinson a couple days ago at lunch.

Why did they chose Phi, Gamma, and Delta as their Greek letters?
Do they mean anything?
What about other Greek organizations like SAE, ATO, ADPi, and PhiMu?

There is an answer. On the FIJI crest there is a Greek motto (which I am spelling phonetically from the original Greek): philotes glukutate dunasteia. But if you were looking at the original Greek it would be pretty clear that the first letter of each of these 3 words spells out Phi Gamma Delta. Translated to English, this phrase means "Friendship, the sweetest influence".

For SAE, the crest actually says Sigma Alpha Epsilon, just spelled out in Greek.
ATO is more based on Christian principles, not really Greek. Their crest says "pi epsilon pi", which is probably a huge chapter secret. I'm not too terribly interested in learning this secret either.

The sororities actually started out as societies, the Adephean Society (ADPi) and the Philomathean Society (PhiMu). As for my own sorority, good old Alpha Delta Theta?

Who the hell knows. We don't have a Greek motto. Sometimes I feel like we knocked off ADPi and/or the security company.