In the electrical layout diagram, the following symbol represents _________. 

The given electrical layout diagram symbol represents a 3-pin, 15A socket outlet.

Symbol Explanation:

• The vertical line represents the electrical connection to the socket.
• The two curved lines indicate the presence of a 3-pin socket, which is commonly used for heavy appliances such as air conditioners, refrigerators, and heaters.
• The 15A rating is suitable for high-power loads.

These appliances require a higher current, so a 15A socket has a thicker wiring system and a separate high-capacity fuse to prevent overheating or damage.