- one of an early series of privately financed, low-orbit, active communications satellites, the first of which was launched July 10, 1962.
- one of a later series of privately financed, geosynchronous communications satellites that provide domestic television, telephone, and data exchange transmission to the U.S.
- either of two low-altitude active communications satellites launched in 1962 and 1963 by the US and used in the transmission of television programmes, telephone messages, etc
