The term "30mm round" refers to a type of ammunition that has a diameter of 30 millimeters. This caliber is commonly used in various military applications, including aircraft cannons and anti-aircraft systems. The 30mm round is known for its high velocity and explosive power, making it effective against both ground and aerial targets. One of the most well-known uses of the 30mm round is in the GAU-8 Avenger cannon, which is mounted on the A-10 Thunderbolt II aircraft. This cannon fires the 30mm rounds at a high rate, providing significant firepower in combat situations. The round's design allows for both armor-piercing and high-explosive variants, enhancing its versatility on the battlefield.