波 - waves, billows, Poland

spread; extension; influence; aftereffect; ripple

ultrasonic waves; ultrasound

tsunami; tidal wave

wharf; quay; landing-stage; jetty

wavelength

Naniwa (former name for Osaka region)

frequency (esp. of waveforms)

short wave

radio wave; reception; signal

brain waves

waves; billows; surge

high waves; heavy seas