Which of the following is NOT a standard hand signal described for pool operations?

• A. Arm straight above head.
• B. Thumbs Up.
• C. Patting of the head.
• D. Clapping.

Answer: (D)

Pool operation signals are designed to be simple, clear, and visible so staff can communicate without shouting or disturbing swimmers. A hand raised straight above the head is used to get attention and indicate stopping or pausing activity, making the intention unmistakable from a distance. A thumbs‑up signal is used to confirm that a task is approved or that conditions are okay to proceed. Patting the head is another recognized gesture within the standard set to convey a specific status or instruction in routine procedures. Clapping, however, isn’t part of the formal signaling system. It’s loud and depends on sound rather than a universal, easily observable gesture, so it doesn’t serve as a reliable, standardized signal in pool operations.