Definitions for "Greek key"
Sometimes referred to as a Grecian Key, this is a carved Classical geometric decoration resembling a maze, and repeated in bands. It's composed of interlocking straight and right-angled lines.
Classical pattern of right-angled vertical and horizontal lines that is generally used for borders.
an ornamental pattern consisting of repeated vertical and horizonal lines (often in relief); "there was a simple fret at the top of the walls"
A fretwork design based on ancient Greek decoration.