T1

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Current revision

T1

• Digital Signal 1, originally over a "T1" interoffice "trunk" or "Transmission Level 1" telecommunications line in North America and Japan
• T1 General tax form used in Canada for personal tax returns
• T1 spinal nerve
  • First thoracic vertebrae
• The Terminator (movie)
• Sun Microsystem's UltraSPARC T1 microprocessor

T-1

• T-1 Jayhawk, a twin-engined jet aircraft used by the United States Air Force
• Terrible One, BMX company

T₁

• A mathematical property of the topological T₁ spaces

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