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