What signal may an operator obey from a person other than the designated signal giver?

The signal that an operator may obey from a person other than the designated signal giver is "Stop." This is crucial for safety on a job site. The "Stop" command is a universal signal that indicates an immediate halt to operations, which ensures the safety of everyone present. It is vital that any worker, regardless of their role, can convey this signal without fear of miscommunication, as stopping operations can prevent accidents and injuries.

The other options are more specific to certain actions that typically require clear communication from the designated signal person to ensure safety and coordination. Those actions generally involve precise movements of the load, which can depend heavily on the context of the task being performed and the cooperation of other crew members. Therefore, while the stop command is universally recognized and empowered to be obeyed by any team member who notices a dangerous situation, the other signals related to hoisting, swinging, or dog everything typically rely on the clarity and coordination that comes from following the designated signal giver.