4"/50 Caliber Gun
The 4"/50 caliber Mark 9 gun (spoken "four-inch-fifty-caliber") was the standard low-angle, quick-firing gun for United States destroyers through World War I and the 1920s. United States naval gun terminology indicates the gun fired a projectile 4 inches (10 cm) in diameter, and the barrel was 50 calibers long (barrel length is 4 inch x 50 = 200 inches or 5 meters).
Read more about 4"/50 Caliber Gun: Description, US Navy Service, UK Service
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—Ralph Waldo Emerson (1803–1882)