Gules /(gūlz)/

Gules

n.
  1. The tincture red, indicated in seals and engraved figures of escutcheons by parallel vertical lines. Hence, used poetically for a red color or that which is red. (Her.)
    His sev'n-fold targe a field of gules did stain In which two swords he bore; his word, “Divide and reign.”
    — P. Fletcher.
    Follow thy drum; With man's blood paint the ground; gules, gules.
    Let's march to rest and set in gules, like suns.