Signal
/ˈsɪɡnəl/
noun
A sequence of states representing an encoded message in a communication channel.
Any variation of a quantity or change in an entity over time that conveys information upon detection.
A sign made to give notice of some occurrence, command, or danger, or to indicate the start of a concerted action.
verb
To indicate; to convey or communicate by a signal.
To communicate with (a person or system) by a signal.
“Seeing the flames, he ran to the control room and signalled headquarters.”
adjective
Standing above others in rank, importance, or achievement.
“a signal exploit; a signal service; a signal act of benevolence”
Synonyms: eminent, noteworthy, significant