To indicate the existence, presence, or fact of, by a signal; as, to signalize the arrival of a steamer
To install a traffic signal at an intersection that is currently regulated by stop signs
communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"
To make signal or eminent; to render distinguished from what is common; to distinguish