What is the little golden coloured metal tab that sticks out the side of the logic board?

Hi,
On the logic board of a 3g and 3gs (i am not sure about the other models) there is a golden coloured tab that sticks out and when the board is in the housing it makes contact with the chrome bezel.
I was wondering what the job of this little part is and what the implications would be if it did not do its job properly.
Thanks

Just be sure no extra parts are left over when you re-assemble it..... as KT said this question goes way, way beyond any guidance than can  be offered at this location. 

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