Which of the following is a type of radio code?

• A. Signals
• B. Phonetic alphabet codes
• C. 10 or numeric codes
• D. Numeric alpha codes

Answer: (A)

Radio codes are shorthand systems that let you convey information quickly and clearly over a radio. A signals code is a category of these codes that uses predefined indicators to represent common situations or instructions. This approach lets responders communicate status or needs with a brief, standardized cue, which reduces confusion, especially in noisy or fast-moving situations. That’s why signals are considered a type of radio code. The other options describe different ways of encoding information—phonetic alphabet codes are about spelling letters clearly over the air, and numeric codes (like ten-codes) are another shorthand system. A signals code specifically refers to those quick, on-the-ground indicators used in radio communication, which is why it fits best here.