SEMAPHORE

noun
16 Scrabble
17 WWF
S 1
E 1
M 3
A 1
P 3
H 4
O 1
R 1
E 1

Definition

Any equipment used for visual signalling by means of flags, lights, or mechanically moving arms, which are used to represent letters of the alphabet, or words.

"The thread increments the semaphore to prevent other threads from entering the critical section at the same time."

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