The term 'Authenticating Mark' is often used to refer to a SEAL, which is a four-letter word. A SEAL is an official mark or symbol used to authenticate documents, products, or services. It is usually a stamp, an embossed impression, or an inked design that is applied to a document or item to show that it has been approved or authenticated by an authorized person or organization. Seals are often used to certify the authenticity of documents, such as contracts, diplomas, and certificates.