🔍 Key Concepts

• Review how fire control plan symbols use letters (like FE, IG, CO₂) to indicate specific fixed installations, not portable equipment. • Think about what an inert gas system on tankers is used for and how its symbol might be shown on a plan. • Compare symbols that represent detectors or gauges versus symbols that mark entire fixed installations or systems.

💭 Think About

• Does this symbol look more like a label for a complete fire‑extinguishing system, or more like a small sensing device such as a detector or gauge? • Which of the options would most logically be shown by a simple two‑letter code on a fire control plan, versus needing a picture of a bottle, nozzle, or instrument? • Look at the other symbols on this sheet that include gas bottles or detectors; how are they drawn differently from this one?

✅ Before You Answer

• Verify whether the two‑letter code on the symbol matches the usual abbreviation for any of the answer choices (for example, inert gas, dry chemical, etc.). • Check how other gas installations (like CO₂ or Halon systems) are depicted here—do they use letters, cylinders, or both? • Confirm that detectors and gauges elsewhere on the sheet are drawn with some kind of sensor or dial shape, not just letters in a box.