Can anybody identify a greek charm?

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I found a seller on ebay identifying a pendant as a tri-delta relic. Yes, I realize that regardless of the situation, she should not be selling anything of the sort, however, I do not recognize this as having any tri-delta symbolgy (with the exception of the obvious triangle.) Can anybody identify which organization it belongs to?

The charm is small and round, with an upside down-triangle enclosed in a hexagon. Within the triangle are a small flower (top left point), a knot that strongly resembles a pretzel (top point), and another knot-like symbol (bottom point.)

Beneath this is a common banner, which appears to read "ΤΟ ΒΡΩΠΟΨ", however what I have interpreted as an omega is very difficult to see.

I feel that it may be a local sorority, as I don't recognize any of these symbols from any sorority I know. If anyone does know, I'd appreciate some ideas!