A semi-automatic pistol is a type of hangun that can be fired in semi-automatic mode, firing one cartridge for each pull of the trigger. This type of firearm uses a single chamber and a single barrel, which remain in a fixed linear orientation relative to each other while being fired and reloaded semi-automatically. Some terms that have been, or still are, used as synonyms for semi-automatic pistol are automatic pistol, autopistol, self-loading pistol, and selfloader.