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I have seen people refer to the "Erling brick" or "headlight brick" on LEGO forums. What kind of brick are they talking about?

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What i want to know is why is the stud inset in the brick? – J. Walker Feb 7 '13 at 16:22
up vote 29 down vote accepted

I definitely know them as the headlight brick, and they look like this:

headlight brick geometry

HoMa's world of bricks has a nice page dedicated to this brick!

LEGO's Pick a Brick lists this as an "Angular Brick 1x1", Design ID 4070 (equivalent to the piece/part id).

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+1: I wish I could +1 again for the HoMa's World of Bricks link too – Umber Ferrule Oct 25 '11 at 21:49

enter image description here

The Erling Brick: named by the LEGO Designer Erling Dideriksen, who invented this element in 1979.

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+1 for etymology – Ambo100 Dec 8 '11 at 14:27
The model shops refer to this brick as a "washing machine" brick :-) – KevinS Nov 16 '12 at 6:01

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