Which hand signal is described as "Extend an arm, palm down; then move the hand back and forth"?

The hand signal described as "Extend an arm, palm down; then move the hand back and forth" is typically used to indicate "Stop." This specific gesture communicates to workers or equipment operators that they need to halt their current actions. The motion of moving the hand back and forth while maintaining a palm-down position is universally recognized in many industries, especially in construction and electrical work, as a clear instruction for stopping.

Understanding this signal is crucial for safety on the job site, ensuring that all personnel can respond appropriately to changes in direction or potential hazards. Recognizing hand signals like this helps maintain communication when verbal cues may be insufficient due to noise or distance, ultimately contributing to a safer work environment.