Ground - "G"

This symbol means that the end of the wire is attached (grounded) to the vehicle's frame or to a metal part connected to the frame.

Fig 1: Wire Ground Symbol

Each wire ground (G) is numbered for reference.

This ground symbol (dot and 3 lines) overlapping the component means that the housing of the component is grounded to the vehicle's frame or to a metal part connected to the frame.

Fig 2: Ground Symbol (Dot And 3 Lines)

This symbol represents the bus bar inside a ground  connector. The dots represent tabs on the bus bar that the wire terminals connect to. The ground symbol (large dot) is the connection between the bus bar and metal (grounded) part of the vehicle.

Fig 3: Ground Symbol (Bus Bar Inside Ground Connector)