Final answer:
The symbol for a dryer pilot switch is not standardized and could vary depending on the schematic. It's essential to check the manufacturer's documentation or the schematic's legend to identify the correct symbol.
Step-by-step explanation:
The symbol that represents a dryer pilot switch is not universally standardized and may vary depending on the schematic or the context in which the switch is being referenced. In electrical schematics, symbols for switches can differ based on the specific type of switch and the nature of the device's circuitry. Without the context of a specific diagram or further clarification, it is not possible to accurately determine which symbol (1, 2, 3, or 7) represents a dryer pilot switch. In practical scenarios, it's essential to refer to the manufacturer's documentation or a legend accompanying the electrical schematic for precise identification of the symbols used.