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Tera

The prefix representing the number 1,000,000,000,000.

Terminal

1. A battery post or connector 2. An electrical connector. 3. The point where two or more conductors are connected.

Terminal Speed

The maximum speed, in drag racing, that a vehicle achieves when passing through the traps at the end of the strip.

Ternary

Having three parts, elements, or divisions.

Test Lamp

A term used for test light.

Test Light

A small, non-powered or self-powered light used to determine electrical continuity in a circuit.

Test Wheel

A controlled procedure by the National Highway Traffic Safety Administration (NHTSA) to perform laboratory tests for temperature-resistance testing of automotive tires as determined by how long the tire lasts on the test wheel. The ratings are A, B, or C, with an A rating having the best temperature resistance.

Tetrachloroethylene

A chlorinated cleaning solvent with four chlorine atoms per molecule.

Tetraethyl Lead (TEL)

A chemical, Pb, once added to gasoline to increase its octane and aid in lubrication of the valves. Lead damages catalytic converters and oxygen sensors and therefore cannot be used in vehicles designed to operate on unleaded fuel. Leaded gasoline is no longer sold in the United States.

Tetrafluoroethane

The chemical name for the "ozone-friendly" refrigerant commonly known as HFC-134a or, more simply, R-134a.

TFI Thick-Film Integration

The name of a Ford electronic ignition system.

TFP

An acronym for Transmission Fluid Pressure.

TGS

Top gear switch.

Th

Thorium An element with the atomic number of 90.

Thermactor

An air pump or air-aspirator, air-injection system by Ford.

Thermactor Pump

A device that injects ambient air into the exhaust system.

Thermal

Pertaining to heat or the energy of heat..

Thermal Cutting

A cutting process that removes metal by localized melting, burning, or vaporizing of the work piece.

Thermal Delay Fuse

A device once used in conjunction with the compressor protection switch that heats and blows a fuse to stop a compressor action during abnormal operation.

Thermal Efficiency

The difference between potential and actual energy developed in a fuel measured in Btu's per pound or gallon (kilogram or liter).