What does LED stand for in those little lights?

Light Emiting Diode.

Light emitting diode. (Link to Wikipedia)

thank you!

How’s that for service? Two posts and two different cites one minute after the question was posted. (Darn my slower fingers, though!)

My Dad used to call a non-working LED a “DED”, or Dark Emitting Diode.

DED is a fairly common term amongst us electronics geeks.