semaphore

v. send a message by semaphore, use handheld flags to communicate a message

n. method of communication based on the use of handheld flags which are moved to represent different letters of the alphabet; (Computers) status flag used to restrict access to shared resources by locking the resource being used and preventing access

A semaphore or optical telegraph is an apparatus for conveying information by means of visual signals, with towers with pivoting blades or paddles, shutters, in a matrix, or hand-held flags etc. Information is encoded by the position of the mechanical elements; it is read when the blade or flag is in a fixed position. In modern usage it refers to a system of signaling using two handheld flags. Other forms of optical telegraphy include ship flags, Aldis lamps, and Heliographs.
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Noun
1. an apparatus for visual signaling with lights or mechanically moving arms
(hypernym) apparatus, setup
Verb
1. send signals by or as if by semaphore
(hypernym) sign, signal, signalize, signalise
2. convey by semaphore, of information
(hypernym) communicate, intercommunicate

n. semaphore, method of communication based on the use of handheld flags which are moved to represent different letters of the alphabet

n. semaphore, status flag used to restrict access to shared resources by locking the resource being used and preventing access