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From Lostpedia

Frank loads his flare gun

Flares and emergency beacons have been used in several instances in Lost:

Frank's flare.

• Sayid used a makeshift flare from a firework to signal to Shannon and Kate to turn on the transceivers. ("The Moth")
• One was seen on the second raft and used to get the attention of another water-borne object, which turned out to be the others. ("Exodus, Part 2")
• One was seen with Naomi, which Hurley fired into the air, possibly alerting Mikhail of their location. ("Catch-22")  ("D.O.C.")
• Frank Lapidus used a flare to alert the other members of his team to his location. ("Confirmed Dead")