Semaphore
noun
A system for sending messages by holding the arms or two flags in certain positions to represent different letters.
The sailors used semaphore to send messages to the other ship.

Often appears as...
- use semaphore
- semaphore signalling
noun
In computing, a variable or an abstract data type that provides a simple but useful means of controlling access by multiple processes to a common resource in a parallel programming environment.
The operating system used semaphores to prevent race conditions.

Often appears as...
- semaphore mechanism
- semaphore variables
Usage tips
Technical
noun
A system for sending messages by holding the arms or two flags in certain positions to represent different letters.
The sailors used semaphore to send messages to the other ship.

Often appears as...
- use semaphore
- semaphore signalling
noun
In computing, a variable or an abstract data type that provides a simple but useful means of controlling access by multiple processes to a common resource in a parallel programming environment.
The operating system used semaphores to prevent race conditions.

Often appears as...
- semaphore mechanism
- semaphore variables
Usage tips
Technical
Definition 1 of 2

Visual Communication
Semaphore is a visual method for conveying information at a distance using signals.

Before radios, semaphore was the swiftest means of ship-to-ship communication.
Manual Signaling
Semaphore involves using body parts or objects to represent letters, requiring good visibility.

The scout leader demonstrated semaphore by positioning flags to spell 'help'.
Nautical Origins
Semaphore has historical roots in maritime communication, vital for safety and coordination.

Mariners learned semaphore to signal other vessels during foggy conditions.
Visual Communication
Semaphore is a visual method for conveying information at a distance using signals.

Before radios, semaphore was the swiftest means of ship-to-ship communication.
Manual Signaling
Semaphore involves using body parts or objects to represent letters, requiring good visibility.

The scout leader demonstrated semaphore by positioning flags to spell 'help'.
Nautical Origins
Semaphore has historical roots in maritime communication, vital for safety and coordination.

Mariners learned semaphore to signal other vessels during foggy conditions.
Visual Communication
Semaphore is a visual method for conveying information at a distance using signals.

Before radios, semaphore was the swiftest means of ship-to-ship communication.
Manual Signaling
Semaphore involves using body parts or objects to represent letters, requiring good visibility.

The scout leader demonstrated semaphore by positioning flags to spell 'help'.
Nautical Origins
Semaphore has historical roots in maritime communication, vital for safety and coordination.

Mariners learned semaphore to signal other vessels during foggy conditions.
Video examples
"You Have the Rite" PIPE...
At the DMV, my boy's in line to officially enter his prime suspect young, brown and behind the wheel, a moving semaphore, signaling the threat of communities from below.
Video examples
"You Have the Rite" PIPE...
At the DMV, my boy's in line to officially enter his prime suspect young, brown and behind the wheel, a moving semaphore, signaling the threat of communities from below.
Example 1 of 1
Quote examples
Antonin Scalia
American Judge
Burning the flag is a form of expression. Speech doesn't just mean written words or oral words. It could be semaphore. And burning a flag is a symbol that expresses an idea - I hate the government, the government is unjust, whatever.

Quote examples
Antonin Scalia
American Judge
Burning the flag is a form of expression. Speech doesn't just mean written words or oral words. It could be semaphore. And burning a flag is a symbol that expresses an idea - I hate the government, the government is unjust, whatever.

Example 1 of 1
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