A Bullet is a solid projectile propelled by a firearm or air gun and is normally made from metal (usually lead). A bullet does not contain explosives, but damages the intended target by tissue disruption and impact. The word "bullet" is sometimes erroneously used to refer to a cartridge, which is the combination of bullet, casing (case or shell), gunpowder and primer. See ammunition.

The Oxford English Dictionary definition of a bullet is "a projectile of lead ... for firing from a rifle, revolver etc." However, bullets for air guns are not part of a cartridge.

Hail is a form of precipitation which consists of balls or irregular lumps of ice (hailstones). Hailstones usually consist mostly of water ice and measure between 5 and 150 millimeters in diameter, with the larger stones coming from severe thunderstorms. Hail is only produced by cumulonimbi (thunderclouds), usually at the front of the storm system, and is composed of transparent ice or alternating layers of transparent and translucent ice at least 1 mm thick.

The METAR code for hail 5 mm or greater in diameter is GR, while smaller hailstones and graupel are coded GS. Unlike ice pellets, they are layered and can be irregular and clumped together.