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Originally posted by sugar and spice
Tri Delta has this too. 
Tri Delta is the only NPC sorority, and the only GLO that I know of, to use the dolphin as mascot.
It is one of the few NPC sororities to use its mascot since the the beginning of the sorority's history. (For those of us Tri Delts who were looking for the answer of when we adopted the use of the dolphin, I found it -- it was an unofficial symbol of the sorority from the beginning, and Sarah Ida Shaw used it in jewelry she gave to the national officers and the editor of the Trident.
As far as I know we are the only sorority to use our jewel, the pearl, not only as a jewel but as a symbol. (I know other sororities have symbolic meanings behind their jewels, but the jewel isn't used as a symbol associated with that group per se.)
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While Tri-Delta is the only NPC to have the dolphin as it's national mascot/symbol, there are other GLO's that use it:
Kappa Phi Iota Sorority Inc.
Xi Delta-at University of Georgia
Sigma Psi Delta (I think?)
Alpha Omega Epsilon Sorority (National sorority for engineers)
Kappa Tau Epsilon (Regional Sorority)
I don't know if they adopted it at inception though or if it was changed/ added later. I didn't realize the pearl was a symbol too, not just the jewel-that's cool.