What is "semaphores"

Usage examples of "semaphores".

Few of the commuters paid any attention to the traffic semaphores, having learned from experience that the rare police launches were reluctant to chase them—the wakes of the launches upset more canoes and rowboats than the speeding outboards did.

The yards were worked by hydraulics rather than electricity and communication on the hull was by handsignals, semaphores, or occasionally helmet-to-helmet contact.

The handsignals and semaphores by which they set the sails in the Matrix generally sufficed for other times as well.

Sylvia was taken through the hospital and the workshops, shown the semaphores, and shut up by Maurice in a "dark cell".