To denote is to draw attention to something or to show what it means. All of the googly-eyed looks that a girl gives to a boy might do more to denote her feelings for him than leaving a note in his locker.
Denote comes from the Latin root dēnotāre, "to mark out." Using a particular facial expression can denote meaning, as in, "All of the crinkled foreheads and squinted eyebrows denoted a lack of understanding among the math students." Words and symbols also point to, or denote, meaning, "If he had used PST to denote the fact that he was in the Pacific time zone, she would have known that it was only 4:00 a.m. and too early to call from New York."