Autograph

An autograph was a signature of a notable person.

When in 2268 and aboard the USS Enterprise (NCC-1701), Benjamin Sisko was able to obtain James T. Kirk's autograph by providing Kirk with a Starfleet crew manifest to sign. 

Sisko chose not to tell Temporal Investigations agents Dulmur and Lucsly he had Kirk's autograph in case they confiscated it.