Gules

Gules
 
ClassColour
Non-heraldic equivalentRed
Monochromatic designations
Hatching pattern 
Tricking abbr.g., gu.
Poetic designations
Heavenly bodyMars
JewelRuby

In heraldry, gules (/ˈɡjuːlz/) is the tincture with the colour red. It is one of the class of five dark tinctures called "colours", the others being azure (blue), sable (black), vert (green) and purpure (purple).

Gules is portrayed in heraldic hatching by vertical lines, or indicated by the abbreviation g. or gu. when a coat of arms is tricked.