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A badge is a device or accessory that usually contains the badge of the organization, the appearance or display of the badge or badge to indicate certain service feats, special achievements, power symbols (e.g., police and fire fighters) granted under oath, signs of legal work or student status, or as simple identification. They are also used for advertising, publicity and brand promotion. The history of the police badge can be traced back to the middle ages, when the Knights wore the badge to represent their loyalty and loyalty.

Badges can be made of metal, plastic, leather, textiles, rubber, etc., which are usually attached to clothes, bags, shoes, vehicles, household electrical equipment, etc. Textile badges or patches can be woven or embroidered, and can be connected by gluing, ironing, sewing or decaling.

Badges have become a very collectible product: in the UK, for example, there has been a circle of badge collectors since 1980.

In the military, the badge is used to indicate the wearer's unit or arm, as well as the qualification and level obtained through military training. Similarly, youth organizations (such as reconnaissance and Mentoring) use badges to display group membership, rewards, and ranks.

Detectives and other plainclothes personnel can wear them on belt clips or on chains around their necks. The shape is varied. The municipal police department tends to change the shape of the shield, while the police chief department usually adopts 5, 6 or 7 stars. In most cases, the enamel seal of the institution, city, county or company can be found in the center of the badge.