trivet
A stand with three short legs, especially for cooking over a fire.
They collected wood and built back the fire and they fetched rocks to make a trivet and there they set the bucket to boil.
A stand, sometimes with short, stumpy feet, or a mat used to support hot dishes and protect a table; a coaster.
A weaver's knife used to cut out the wire that was used to form a pile.
Where it comes from
From Middle English trevet, from Old English trefet, borrowed from Latin tripēs, tripedis (“tripod”).
Adapted from the Wiktionary entry trivet (CC BY-SA 4.0).