1.
a flat spiral-shaped firework that is fastened to a vertical surface with a central pin, on which it spins, shooting out sparks or flames, after being lit.
2.
in heraldry, a circular window divided by ribs radiating from the centre
3.
a circular fireworkan object that burns to produce coloured light and noise that you fix to something so that it spins around when it starts to burn. The American word is pinwheel.