jargon.artrocity.com
New Hacker's Dictionary the Jargon File v 4.4.6
n.
1. [TMRC, from ‘Light-Emitting Diode’] A light-emitting resistor (that is, one in the process of burning up). Ohm's law was broken. See also SED.
2. An incandescent light bulb (the filament emits light because it's resistively heated).