A Vayan horn fly was an insect known for swarming up in large groups when some of them are attacked.
In 2369, Chief O'Brien compared the artificial satellite system guarding a Gamma Quadrant moon to Vayan horn flies, because he feared that when his runabout would destroy one of the satellites, all other satellites would attack the ship. (DS9: "Battle Lines")
According to the script, Vayan was pronounced as "VAYE-yahn". 
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