Signatories(noun)
A person, a country or an organization that has signed an official agreement.
Hindi meaning:हस्ताक्षरकर्ता
Synonyms: endorser, signer, certifier, cosignatory
Antonyms: activist, entrepreneur, acumen, participant
Example: The signatory should provide any support required.
Trick to remember: Signatories ne sign kiya. 
