Hockey puck - Wikipedia
https://en.wikipedia.org/wiki/Hockey_puckA hockey puck is either an open or closed disk used in a variety of sports and games. They are designed to serve the same function a ball does in ball games. A closed disk made of vulcanized rubber is used in the sport of ice hockey. The closed disk has also been referred to as a "Flat Ball."
Projectile - Wikipedia
en.wikipedia.org › wiki › ProjectileA projectile is a missile propelled by the exertion of a force which is allowed to move free under the influence of gravity and air resistance. Although any objects in motion through space are projectiles, they are commonly found in warfare and sports (for example, a thrown baseball, kicked football, fired bullet, shot arrow, stone released from catapult).