<electronics, humour> (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.
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Nearby terms: LIGHT « light client « light-emitting diode « light-emitting resistor » light pen » light pipe » light-weight