Alternative form of at sign

The username and password for logging in to a computer account. / An attempt to log in. / (more generally) An instance of signing on to something. / A person who signs on to something.

plural of sign

Third-person singular simple present indicative form of sign

The act of concluding a contract, especially by an athlete or entertainer with a company. / (by extension) A player signed by a sporting organization.

present participle of sign

Third-person singular simple present indicative form of sign in

present participle of sign in

Third-person singular simple present indicative form of sign on

present participle of sign on