Definition

Noun: A signal flag is a rectangular piece of fabric, often part of a standardized system, used as a signaling device to communicate messages over a distance, typically in maritime, military, or railway contexts.

Usage

A signal flag is used to convey specific letters, numbers, words, or standardized messages. It is a visual communication tool where each unique flag design represents a specific meaning according to an established code, such as the International Code of Signals.

Examples

• The ship raised a signal flag to indicate it required a pilot.
• Sailors must learn the meaning of each signal flag in the maritime code.
• During the naval exercise, the admiral's orders were communicated using signal flags.

Advanced Usage

• "To fly a signal flag": To display a specific flag to send a message.
  • The vessel flew a quarantine signal flag upon entering the harbor.
• "Signal flag hoist": A group of multiple signal flags displayed together to form a more complex message.
  • The signal flag hoist spelled out the ship's name.

Variants and Related Words

• Code flag: Another term for a signal flag used in a specific signaling system.
• Semaphore: A system for signaling using flags held in specific positions, distinct from individual rectangular signal flags.
• Pennant: A tapering flag, often used in signaling sequences alongside rectangular signal flags.

Synonyms

• Maritime flag
• Nautical signal
• Communications flag

Related Phrases

• "Run up a signal flag": To quickly raise a signal flag.
  • They ran up a signal flag to warn of the approaching storm.
• "Dip a signal flag": To lower a flag briefly as a form of salute or acknowledgment.
  • The yacht dipped its signal flag in greeting.

Related Idioms

• "Show your true colors": (Originating from naval use of flags) To reveal your true character or intentions. While not using the term "signal flag," the idiom is historically connected to the use of flags for identification.
  • He seemed friendly at first, but he soon showed his true colors.

Noun

1. a rectangular piece of fabric used as a signalling device