T1

T1 or T-1 is used for various purposes as a designation, abbreviation or identifier:

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• In telecommunications see DS1 and T-carrier.
• In Canada, "T1" the form number for the personal income tax return.
• In topology, see T1 space.
• A T-1 is also a training aircraft used by the United States Air Force.
• T1 relaxation time (or spin-lattice relaxation time), is a biological parameter that is used in MRIs to distinguish between tissue types.
• A subway car designed and built by Bombardier for the Toronto Transit Commission's subway lines; see T1 (subway car).
• In Australia, T1 is used to refer to the first partial float of the formerly government-owned Telstra telecommunications provider in September, 1997.