The movement of the tower top turbine that allows the turbine to stay into the wind.

The angle between a line in the direction of wind and a plane through the longitudinal and vertical axes of a turbine.

To ensure the wind turbine is producing the maximum amount of electric energy at all times, the yaw drive is used to keep the rotor facing into the wind as the wind direction changes.

A yaw motor powers the yaw drive.

see Ship motions.

Yellowcake is a type of uranium concentrate powder obtained from leach solutions, in an intermediate step in the processing of uranium ores.

Yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior.

The yield strength or yield stress is a material property and is the stress corresponding to the yield point at which the material begins to deform plastically.

A structure at the end of the vessel that allows only angular relative movement between the vessel and the mooring attachment to the seabed.

Young's modulus, or the modulus of elasticity in tension, is a mechanical property that measures the tensile stiffness of a solid material.