A sign for the control of traffic or the information of drivers.

simple past tense and past participle of sign on

A sign for the control of traffic or the information of drivers.

Any distinguishing mark, such as a tattoo, that serves to identify a member of a particular gang

An indication that something is a paraphrase or direct quote. / A phrase that signals a particular meaning or stance.

plural of signal phrase

(chemistry) A covalent atomic bond that is rotationally symmetric about its axis.

A gang sign.

(idiomatic) Something that is symbolic of an era.

A signal that only takes discrete values (contrasted to an analog signal that can take continuously varying values).