Abbreviation for room temperature Measurements of titanium products properties are done at room temperature and some at specific elevated temperatures RT is used to identify a measurement taking place at room temperature
Route Target A 64-bit value by which the IOS discriminates routes for route updates in VRFs
Remote Terminal Local loop terminates at Remote Terminal intermediate points closer to the service user to improve service reliability
Recreation Therapy A professional therapeutic process which utilizes recreation services for purposive intervention in some physical emotional, and/or social behavior to bring about a desired change in that behavior and to promote the growth and development of the individual
Radio Telephony - The means of communication between ATC and pilots Used to indicate the means (You can use datalink instead of RT) as well as the language and protocol (How's your RT? I haven't used mine in ages) See also the Introduction to Radio Telephony