Every engineering office uses their own set of symbols; however, the symbols below are fairly common across many offices. Refer to the symbol sheet for special symbols used in a particular set.
Weatherproof Duplex Outlet
Ground Fault Circuit Interrupt Duplex Outlet
Duplex Outlet - One Receptacle Controlled by Switch
Duplex Outlet on Emergency Branch
Double Duplex Outlet (aka Quad Outlet)
Switch with Built-In Dimmer
Recessed Floor Box