Liaison
A liaison was an individual who acted as an intermediary between two parties. This person could be officially designated as a liaison officer.

In 2267, Governor Kor appointed "Baroner" (who had been described as a leading citizen of the Organians) as a liaison between the occupying forces (the Klingons) and the civil population (the Organians). ()

In 2268 while recording an entry in the ship's log, Hikaru Sulu described Ensign Pavel Chekov as the liaison between Captain James T. Kirk and the . () 

In 2366, Captain Rachel Garrett made Lieutenant Richard Castillo the liaison between the  and the . ()

In 2367, Hayne demanded to Jean-Luc Picard that Ishara Yar be their liaison between the Enterprise-D and his Coalition. ()

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Communication occupations