A trivet is a three-legged stand for holding cooking pots, &c. Trivets are often ornamental, and may be round or triangular; the round form is older in period armory, found in the canting arms of Tryvette as early as 1295 [ANA2 552]. The triangular form is specified in Society blazon.
The trivet is normally drawn in an early attempt at perspective, showing the top to the viewer, with all three legs visible.
Society armory also has the “tripod”, similar to the trivet, but larger and tetrahedral in outline; it encloses its load, instead of resting underneath it. The tripod is never used alone, but only in conjunction with another charge (typically a cooking pot), which it supports. The arms of Larrea, mid-16th C., show a cauldron so suspended [Armeria 358].
Alastar Scott MacCrummin bears: Or, three triangular trivets azure.
Gwenhwyvar ferch Owen ap Morgan bears: Per chevron argent and azure, a triangular trivet argent.
Brekke Franksdottir bears: Sable, a cooking pot hanging from a tripod above a flame in base argent.