FTS
[1] Federal Telecommunications System (of the US Government)[2] Federal Telephone System
[3] Flight Telerobotic Servicer \{Weltraumfahrt\}
[4] Frequency & Timing (Sub)System (->""IEEE" Standard Dictionary")
[5] File Tracking System
[6] FIDONET Technical Standard
[7] Flight Test System (->""NASA" Acronym List")