are an extinct one-episode
race from the TNG
episode "Contagion". Their most notable achievement was a teleportation
technology capable of operating over vast interstellar distances. Despite this strategic advantage, they were apparently wiped out by one or more enemy races centuries before the Federation
An ancient Iconian probe was also able to install code on the computers of the USS Yamato, USS Enterprise, and a Romulan Warbird; the Iconian code attempted to overwrite existing code on those computers, causing numerous system failures on the affected ships.