What is the noun for signature?

The noun for signature is signature itself. It can be used as both a noun and a verb.

Here are some examples:

Noun:

* "The artist's signature is a small circle with a dot in the center."

* "He put his signature on the document."

Verb:

* "She signed the letter."

* "He signed the contract with a flourish."

While "signature" is the most common and direct noun form, you could also use related terms depending on the context:

* Autograph: A person's handwritten signature, often given as a memento.

* Sign: A symbol, mark, or gesture that represents something.

* Mark: A distinctive feature or characteristic.

* Endorsement: A written statement of approval or support.