Fretwork

[Sarah]

Work adorned with frets; ornamental openwork or work in relief,esp. when elaborate and minute in its parts. Heuce, any minute playof light andshade, dark and light, or the like.Banqueting on the turf in the fretwork of shade and sunshine.Macaulay.

[Raeanne Dimick]

decorative open patterns especially cut out of wood or metal or made in embroidery

[Rihanna]

Ornamental design in wood, typically openwork, done with a fretsaw.