ˈtrīˌglif noun
Etymology: Latin triglyphus, from Greek triglyphos, from tri- three + glyphē carved work — more at tri- , glyph
: an architectural ornament in the frieze of the Doric order consisting of a slightly projecting rectangular tablet, having two vertical channels of V section and two corresponding chamfers or half channels on the vertical sides, and being repeated alternately with the metopes — see glyph