Zw

Z Weighting
Z-weighting is a flat frequency response of 10Hz to 20kHz 1.5dB. This response replaces the older "Linear" or "Unweighted" responses as these did not define the frequency range over which the meter would be linear.
Zwicker Loudness
This is an objective method for measuring noise.
Zwitterion
A particle that contains both positively charged and negatively charged groups.
Zworykin, Vladimir Kosma
Played a role in the practical development of television from the early thirties, including charge storage-type tubes, infrared image tubes and the electron microscope.