Literally, 'remote measurement.' Term used to describe performance data being returned from spacecraft such as Voyager, Pioneer and the Space Shuttle, or even from Indy 500 racing cars, etc. Although typically sent via a radio link, telemetry is independent of the means used to transmit it; it is a flow of information, not of signal. Telemetry can and has been transmitted by such diverse means as radio, sonar, cabling, or even fluid or gas line pressure.