Headlights on American cars feature three "nipples" sticking out of glass surface, European cars don`t, why?

Question:
In European countries is even e legal to have them, who knows, why are they here in the US in a first place?

Answers:

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The protrusions used to be used with some styles of headlight aiming fixtures.

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Has to do with the manufacture of lamps, getting them out of the molds.

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Trackerrrr is correct, they used to align the aiming device that attached by a large suction cup.

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