See also: pw, PW, and .pw ㎺ U+33BA, ㎺ SQUARE PW ← ㎹[U+33B9] CJK Compatibility ㎻ →[U+33BB] Translingual Symbol pW (metrology) Symbol for picowatt, an SI unit of power equal to 10−12 watts.Wikiwand - on Seamless Wikipedia browsing. On steroids.