Badge (noun)

1. A symbol or emblem worn on clothing or a hat to indicate rank, occupation, or membership in an organization.
2. A small piece of metal or plastic with a design or inscription, worn as a symbol of authority or achievement.
3. A small piece of metal or plastic that is attached to a product or packaging to indicate authenticity or compliance with regulations.

Origin:

From the old french word "bague" meaning a sign or symbol of something, which is derived from the germanic word "bakkon" meaning a sign.

Examples:

1. He wore a badge indicating his rank as a police officer.
2. She wore a badge indicating her membership in a club.
3. He wore a badge indicating his occupation as a doctor.
4. She wore a badge indicating her achievement in a competition.
5. He had a badge attached to his car indicating compliance with emissions regulations.