In heraldry, gules is the term used to describe the color red. It is derived from the Old French word for "red" and is one of the most commonly used colors in coats of arms and other heraldic devices. Gules typically signifies courage, bravery, and strength, and is often used to represent blood, fire, or passion. It is also closely associated with the martyrs of the Christian faith and is often used in depictions of medieval battles and religious events. Overall, gules is an important and highly visible color in the heraldic tradition and is recognized around the world as a symbol of power and authority.