Signatory
A signature (; from Latin: signare, “to sign”) is a handwritten (and often stylized) depiction of someone’s name, nickname, or even a simple “X” or other mark that a person writes on documents as a proof of identity and intent. The writer of a signature is a signatory or signer. Similar to a handwritten signature, a signature work describes the work as readily identifying its creator. A signature may be confused with an autograph, which is chiefly an artistic signature. This can lead to confusion when people have both an autograph and signature and as such some people in the public eye keep their signatures private whilst fully publishing their autograph.
Signee (noun)
One who signs a contract, especially in athletic contexts
“Our team has landed some great signees in this draft.”
Signatory (noun)
One who signs or has signed something.
“John Hancock is famous for being the first signatory to the American Declaration of Independence, and for writing his name large.”
Signatory (adjective)
Relating to a seal; used in sealing.
Signatory (adjective)
Signing; joining or sharing in a signature.
“signatory powers”
Signatory (noun)
a party that has signed an agreement, especially a state that has signed a treaty
“the signatory states”
“Britain is a signatory to the convention”