Wiring Diagram

'A wiring diagram is a simplified conventional pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the power and signal connections between the devices.'

https://en.wikipedia.org/wiki/Wiring_diagram

This could be for a house, or for a machine, or for a circuit. This can be a formal or informal diagram.

For formal representation, these are house wiring symbols - [1]