Torpedoes are self-propelled weapons that travel underwater, typically carrying a warhead intended to damage or disable a vessel. Naval torpedoes may be launched from submarines, surface ships, or aircraft, and their propulsion and guidance systems vary: some use onboard sensors to seek a target, while others can be guided during their run. Anti-submarine torpedoes are designed to engage submarines, and lighter, smaller designs serve different launch and mission requirements. The category's examples reflect both practical naval terminology and more imaginative uses of the word, spanning anti-submarine and compact forms as well as fictional-sounding variants.