Identify common electrical safety symbols and their meanings.

The grounding symbol, which indicates a connection to the earth, is crucial in electrical systems as it represents the safe path for electrical current to flow in case of a fault. This symbol is often used in diagrams and circuit designs to signify that equipment and electrical systems must be properly grounded to prevent shock hazards and to ensure the safe operation of electrical devices. Grounding is essential for enhancing safety by mitigating risks associated with electrical surges, faults, and stray currents, thereby protecting both personnel and equipment.

In contrast, the other options do not accurately represent established electrical safety symbols. For example, a lightning bolt typically indicates a high-voltage hazard or a function switch, but it does not signify grounding or safety directly. The "no" symbol relates more to prohibitions or restrictions, rather than circuit breaker sizes, while a shield symbol is associated with protection or shielding but does not specifically denote protected wiring in the context you're referring to. Only the grounding symbol has a well-established meaning connected to electrical safety practices.