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.

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.

Something characteristic; a mark; a token.

(obsolete, thieves' cant) A brand on the hand of a thief, etc.

(nautical) A carved ornament on the stern of a vessel, containing a window or the representation of one.

(heraldry) A distinctive mark worn by servants, retainers, and followers of royalty or nobility, who, being beneath the rank of gentlemen, have no right to armorial bearings.

(graphical user interface) A small overlay on an icon that shows additional information about that item, such as the number of new alerts or messages.

(Internet, video games) An icon or emblem awarded to a user for some achievement.

(slang) A police officer.