In Japan, this was the kamon for the Hojo clan, and would be blazoned "mitsu uroko," or "three scales."
This symbol appears in the Zelda games as "the Golden Triforce," and submissions run the risk of being returned if they contain multiple overt references to that game franchise, but its use in the Society is allowed if those references are not overpowering.
http://heraldicart.org/triangle/
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