Transceiver
From Memory Alpha, the free Star Trek reference
A transceiver was a communications device that combines a transmitter and a receiver. To be considered a transceiver, the handling circuitry of both functions must be significantly integrated.
Both the communicator and the combadge are examples of subspace transceivers.(citation needed • edit)
The early Earth probe Friendship 1 contained instructions for building transceivers, among other data. (VOY: "Friendship One")
The starship of the wisps, encountered by Enterprise in 2152, did not contain a transceiver. (ENT: "The Crossing")
