the.com/fireplace mantel

means The ledge or shelf built above a fireplace, originally to catch smoke and direct it upward, now used mostly to display things you want people to notice.

from Comes from 'mantel,' a variant spelling of 'mantle' — the word for a cloak or covering garment, from Latin 'mantellum.' The fireplace surround was called a mantle because it draped over and covered the hearth like a cloak over shoulders. English eventually split the spelling: 'mantle' stayed with cloaks and figurative coverings (as in 'mantle of responsibility'), while 'mantel' settled on the fireplace shelf, though the two were once freely interchangeable.