hz: hertz
  Hertz
       n 1: the unit of frequency; one Hertz has a periodic interval of
            one second [syn: {Hertz}, {Hz}, {cycle per second}, {cycles/second},
             {cps}, {cycle}]
       2: German physicist who was the first to produce
          electromagnetic waves artificially (1857-1894) [syn: {Hertz},
           {Heinrich Hertz}, {Heinrich Rudolph Hertz}]
Some well-known hz: