signature

a person's name in their own hand, put on a paper as proof of who they are or that they accept it

(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.

A distinguishing feature or product.

(figurative) A mark or sign of implication.

An act of signing one's name; an act of producing a signature.

A pattern used for matching the identity of a virus, the parameter types of a method, etc.

Data attached to a message that guarantees that the message originated from its claimed source.

Signs on the stave indicating key and tempo, composed of the key signature and the time signature.

A group of four (or a multiple of four) sheets printed such that, when folded, they become a section of a book.

The part of a doctor’s prescription containing directions for the patient.

A tuple specifying the sign of coefficients in any diagonal form of a quadratic form.

(no longer used) 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.

Distinctive, characteristic, indicative of identity.

To sign with one's signature, to write one's signature on.