The phrase "sentry guns" refers to automated guns or weapons that are placed in specific locations to protect and guard against potential threats or intruders. Full definition
Toby Walsh, a computer scientist at the University of New South Wales in Sydney, Australia, who organized the boycott, fears that the research will be applied to autonomous weapons, which can include unmanned flying drones or submarines, cruise missiles, autonomously operated sentry guns, or battlefield robots. (sciencemag.org)
Freedom Bear Giant Teddy Bear + Light Machine Gun He may look like a cute and cuddly bear, but he's actually an automatic sentry gun. (co-optimus.com)
Killstreaks have now become customisable and have a large range to choose from, such as sentry guns and harrier airstrikes. (wolfsgamingblog.com)