Seal (device)
From Wikimedia Commons, the free media repository
A seal is an impression printed on, embossed upon, or affixed to a document (or any other object) in order to authenticate it, in lieu of or in addition to a signature. The word is also used to describe the device used to make this impression. The study of seals is known as sigillography.
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14th century seal of the Teutonic Knights
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Diploma, Geneva, 1974