badge

A distinctive mark, token, sign, emblem or cognizance, worn on one's clothing, as an insignia of some rank, or of the membership of an organization.

"the badge of a society; the badge of a policeman"

A small nameplate, identifying the wearer, and often giving additional information.

A card, sometimes with a barcode or magnetic strip, granting access to a certain area.

To mark or distinguish with a badge.

"The television was badged as 'GE', but wasn't made by them."

To show a badge to.

"He calmed down a lot when the policeman badged him."

To enter a restricted area by showing one's badge.