Up
- Upper Control Arm
- The control arm that extends downward from the frame of the vehicle to connect with the axle.
- Upper Frequency Cutoff
- The highest frequency a circuit can pass.
- Upper Quartile
- The 75th percentile, calculated by ordering the data from smallest to largest and finding the value which lies 75% of the way up through the data.
- Upper Sideband
- All of the sum frequencies above the carrier.
- UPS
- A type of power supply designed to support the load for specified periods when the line varies outside specified limits.
- upsilon
- A letter of the Greek alphabet.
- Upstream Face
- The side of a dam that is against the water.
- Upwind
- The direction from which the wind is blowing. Also the windward side of an object.