.38 police special
A .38 Police Special or simply .38 Special was a revolver produced specifically for police and law enforcement officers on Earth, issued in the 20th century. 

In 1969, USAF personnel assigned to the 498th Air Base in Omaha, Nebraska were armed with this weapon. ()
 
While on shore leave on the Shore Leave Planet in 2267, Lieutenant Sulu found a .38 Special lying on the ground, an object which he had always desired for his collection. He then decided to do some target shooting by discharging the weapon, alerting the attention of Captain Kirk and Spock. Kirk later on used it to "kill" the Black Knight when phasers weren't working. ()

See also 
 Smith & Wesson Model 15

External link
 
 
 
Hand-held weapons
Projectile weapons