Why is the French late Gothic style called Flamboyant?

The French late Gothic style is called Flamboyant because of its most conspicuous visual feature: the dominance of flamelike, S-shaped curves within the stone window tracery.12

The term is derived from the French word flamboyer, meaning "to flame," reflecting the style's characteristic waving curves that suggest the appearance of fire. Evolving from the Rayonnant style during the 15th century, this phase of Gothic architecture emphasized extreme decoration. Architects reduced wall surfaces to a minimum to allow for expansive windows, often obscuring structural logic by covering both masonry and windows with elaborate, intricate tracery, pinnacles, and gables.312