[W]

Wall Thickness - The thickness of an insulation or jacket.

Water Absorption - water by percent weight absorbed by a material after a given immersion period.

Water Blocked Cable - a cable constructed with no internal voids in order to allow no longitudinal water passage under given pressure.

Watt - A unit of electrical power.

Wavelength - The distance between positive peaks of a signal. As the frequency increases, and waves get closer together, the wavelength decreases.

Wicking - the longitudinal flow of a liquid in a wire or cable due to capillary action.

Wire - a single conductor, typically with a covering of insulating.

Wire Gauge - a measure of the diameter or size of wires. The sizes are expressed by numbers.

Working Voltage - see voltage rating