signal light

Thân thiện

A ship uses a signal light to warn others of danger.

Definition

1. Noun:
   • A fire set as a signal: A light, often a controlled flame or beacon, intentionally ignited and used to convey a message, warning, or information over a distance.

Usage

• The term "signal light" refers specifically to a light source whose primary purpose is communication or signaling. It is a compound noun where "signal" functions as an adjective describing the type of "light." It is used to describe a physical object or source of illumination.

Examples

• Noun:
  • The lighthouse keeper lit the signal light to warn ships of the rocky coast.
  • Rescuers used a signal light on the hilltop to guide the lost hikers to safety.

Advanced Usage

• "To set a signal light": To intentionally ignite or activate a light for signaling purposes.
  • The scouts were taught how to set a signal light in case of an emergency.

Variants and Related Words

• Signal fire: A fire built specifically to send a smoke or light signal. This is a closely related compound term.
• Beacon: A light or fire serving as a signal, typically in a fixed location.
• Flares: Devices that produce a bright, often colored, light used as a distress signal.

Synonyms

• Beacon: A sustained, conspicuous light set up in a high or important position as a warning or guide.
• Warning light: A light that signals a hazard or alert.

Related Phrases

• Distress signal: A signal, which may be a light, indicating a state of emergency.
  • They activated the distress signal light when the engine failed.

Notes

• "Signal light" is a specific type of light with a communicative function. It is distinct from general-purpose lights like room lights or streetlights. In modern contexts, it often refers to electric or electronic lights (e.g., traffic signal lights, railway signal lights), though the core concept of a light used for signaling remains.

Học thuật

Noun

1. a fire set as a signal

Từ đồng nghĩa

• signal fire