Definitions from Wiktionary (signature)

▸ noun:  A person's name, written by that person, used as identification or to signify approval of accompanying material, such as a legal contract.
▸ noun:  An act of signing one's name; an act of producing a signature.
▸ noun:  (medicine) The part of a doctor’s prescription containing directions for the patient.
▸ noun:  (music) Signs on the stave indicating key and tempo, composed of the key signature and the time signature.
▸ noun:  (printing) A group of four (or a multiple of four) sheets printed such that, when folded, they become a section of a book.
▸ noun:  (computing) A pattern used for matching the identity of a virus, the parameter types of a method, etc.
▸ noun:  (cryptography) Data attached to a message that guarantees that the message originated from its claimed source.
▸ noun:  (figurative) A mark or sign of implication.
▸ noun:  A dish that is characteristic of a particular chef.
▸ noun:  (mathematics) A tuple specifying the sign of coefficients in any diagonal form of a quadratic form.
▸ noun:  (medicine, obsolete) A resemblance between the external character of a disease and those of some physical agent, for instance, that existing between the red skin of scarlet fever and a red cloth; supposed to indicate this agent in the treatment of the disease.
▸ noun:  (Internet) Text (or images, etc.) appended to a user's emails, newsgroup posts, forum posts, etc. as a way of adding a personal touch or including contact details.
▸ adjective:  Distinctive, characteristic, indicative of identity.
▸ Also see signature

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