Noun
an ornamental pattern consisting of repeated vertical and horizontal lines (often in relief)
Source: WordNetthere was a simple fret at the top of the walls Source: Internet
The Medusa and the signature Greek key both figured prominently, while polka dots and flags added an element of surprise. Source: Internet
It is an 8-stranded " Greek key " beta-barrel, with the active site held between the barrel and two surface loops. Source: Internet