signal

Synonyms: arresting arrestive characteristic conspicuous distinctive distinguished eminent exceptional eye-catching famous illustrious individual marked memorable momentous notable noteworthy noticeable peculiar prominent pronounced remarkable renowned salient significant striking

Antonyms: insignificant unexceptional unimpressive unnoteworthy

Synonyms: alarm alert beacon bleep blinker cue flag flare gesture go-ahead green light high sign indicator mark mayday movement nod okay omen sign sos tocsin token wink

Synonyms: beckon communicate flag flash gesticulate gesture motion nod semaphore sign signalize warn wave wink