The term 'passport feature' can be summarized as a STAMP, which is a five-letter word. A passport feature is an element of a passport that is used to identify the holder and verify their identity. It usually includes a photograph, signature, and other personal information. The STAMP is a physical mark that is placed on the passport to indicate that it has been issued by a government authority. This STAMP serves as a form of authentication and is used to prevent fraud and forgery.