I love our coat of arms. Its our colors (silver, gold, blue and the combination of green), our motto on the bottom meaning "let us steadfastly love one another".
In tri delta we have three stages of membership: new member (where you are a pearl), college (a pine tree) and an alum ( a pansy). I love how our crest has three of the stages.
Looking at the other crests I think its kind of different that on our crest we don't have our letters on it at all.

Our flag is the combo of all our colors, the pinetree, then three stars which have to do with the night we were founded.
I wish we used our flag more. I can't even find a place to purchase it.