Sub guns, short for submachine guns, are often referred to by different names depending on their function, region, or appearance. Some synonyms for sub guns include machine pistols, automatic carbines, compact firearms, CQB weapons, PDWs (personal defense weapons), and SMGs (submachine guns). In military jargon, sub guns are called sub guns or SMGs, while in America, they are also known as tommy guns, popularized by gangster movies of the 1930s. Other colloquial terms for sub guns include grease guns, berettas, and Uzis, which are all named after the popular models of sub guns. Though the term sub guns encompasses a wide range of firearms, varying in size, caliber, and design, these synonyms highlight various aspects of sub guns that make them a powerful and effective tool in self-defense, law enforcement, and military operations.