Source : Free On-Line Dictionary of Computing

light-emitting resistor
     
         (LER, from "{light-emitting diode}") A
        {resistor} in the final stages of burning up.
     
        (Though intended as purely humorous, the term could sensibly
        describe the filament of a common incandescent electric light
        bulb).
     
        See also {SED}.
     
        (1996-02-06)