signer

noun

1. One who signs (in any sense of that verb).

   “Near-synonyms: undersigned, subscriber”

   “John Hancock is a famous signer of the Declaration of Independence.”

2. One who signs (in any sense of that verb).

   “Among the hundreds of signers at the conference, most were native signers.”

3. One who signs (in any sense of that verb).

   “The most prolific signers were to be amply rewarded by the sales-bonus structure.”