What does the hand signal with palm down and lower arm vertically signify?

The hand signal described, with the palm down and the lower arm held vertically, is universally recognized as a signal to lower the tines of a lifting device, such as a forklift or crane. This position indicates to the operator that they should move the load downward in a controlled manner.

In the context of hoisting operations, clear and unmistakable communication between signal persons and operators is crucial for safety and efficiency. The vertical arm with a palm-down position serves as a visual cue that the operator should bring the tines or lift down towards the ground. This hand signal is part of standard operating procedures often outlined in safety training for those involved in lifting operations.

Other options represent different actions that would require different signals. Understanding these distinctions ensures that all personnel on a job site are operating with maximal coordination and safety in mind.