Red. One of the seven basic heraldic tinctures, and specifically, one of the five colors.
Red (from Arabic gul, a red rose), abbreviated GU
The heraldic term for red (Valentine 71). See related terms: Argent, Sable
In heraldry, gules is the tincture with the colour red, and belongs to the class of dark tinctures called "colours". In engraving, it is sometimes depicted as a region of vertical lines or else marked with gu. as an abbreviation.