Transponder

A transponder is a device that emits a signal.
Transponders were used on starships and space stations to emit identification information allowing for easily recognition. 
In an alternate universe, Kira Nerys gave Jake Sisko a transponder to tag the Reckoning Tablet with in case he could not convince Weyoun to return it to the Bajorans as it would allow for her people to track the tablet and transport out of the Dominion's possession.
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Category:Communications technology