signatario
Signatario is a term used in several Romance languages to denote a signatory: a person or entity that signs a document. It is commonly applied to the party that affixes its signature to a treaty, agreement, or contract. Depending on the jurisdiction, a signatario may be an individual, a company, a state, or an international organization.
In international law, signatories of a treaty or convention are the states or organizations that have signed
In civil contexts, signatario refers to the person whose signature appears on a document, indicating consent