What does HW stand for?

Half-Wave

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

Other Resources:

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Hrvatska Vatrogasna Zajednica (Croatian: Croatian Fire Board) Hurricane Vulnerability Zone (Florida) Hidden Valley Zen Center (San Marcos, CA) Horizontal/Vertical Zig-Zag First Schedule Honest-Verifier Zero-Knowledge (cryptography) Henk Van Zon Ministries (Netherlands) High Volume, Zero PEEP (Positive End Expiratory Pressure) Hauptverwaltung Zivilverteidigung (German: Civil Defense Main Administration) Herpes Varicella-Zoster Virus Hacked Website		Half-Word Hall-Way Halo Wars (game) Hand Weeding Hand Wheel (automotive steering systems) Handwriting Hanford Works Hard Water Hard Wired Hardware

Samples in periodicals archive:

BS, beam splitter; LP, long-pass filter; BP, band-pass filter; HWP, half-wave plate; LPol, linear polarizer; S, sample; SIL, solid-immersion lens; PD1, PD2, avalanche photodiodes.

United States: Laser Switched Optical Transistor Could Enable future ...