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A warning buoy, also referred to as a warning beacon or a marker beacon, was a type of space buoy that could be deployed to maintain position in space and transmit a repeating message warning about something nearby. (TNG: "Identity Crisis"; et al.)
In 2154, Captain Jonathan Archer left a warning beacon in orbit of an M-class planet that hosted a Klingon garbage site to warn others of the very lethal silicon-based virus one could find there. (ENT: "Observer Effect")
In 2266, the USS Enterprise encountered a cube-shaped warning buoy at the border of First Federation space. These buoys were designed to follow any ship approaching their space and emitted lethal radiation to force the approaching ship to destroy the buoy. This action would prompt the First Federation to initiate contact. (TOS: "The Corbomite Maneuver")