A fireball is a metallic sphere, spewing flame; it was thrown at the enemy as an incendiary device. It is a period charge, found in the arms of Dancaster, 1556 [Parker 257]. When “proper”, the sphere is sable, and the flames gules and Or.
Society heraldry distinguishes between the fireball, which spews four flames in cross, and the “grenade” or “(fire)bomb”, which spews a single flame to chief. See also weapons.
The Prince of the Sun bears: Argent, a fireball proper within a laurel wreath, in chief an ancient crown azure.
Ian of Loch Naver bears: Argent chapé sable, a fireball gules enflamed proper.
Willoc of Evensong Forest bears: Sable, a grenade argent flamed Or.