An ornamental architectural element consisting of two vertical channels or grooves carved into a surface.
From Greek 'di-' (two) and 'glyph' (carving/groove), from 'glyphein' (to carve). Used in classical architecture to describe variations of the triglyph pattern.
Diglyphs are the shy cousins of triglyphs—Greek temples used triglyphs with three grooves, but sometimes architects got creative with two-groove variations for special effects!
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