15c19fcd__and_Schematic_Diagram_Symbols__Electronic_Component
[Circuit Symbol] 2-Way Switch (SPDT) Circuit Symbol [Description] Also known as the 2-way switch. It can be also called as an ON/OFF/ON switch as it has an OFF position in the center. The switch causes the flow of current in two directions, depending on its position. It can be abbreviated as SPDT. [Electronic Component] 
Single Pole Double Throw Switch
Electronic Circuit Symbols - Components and Schematic Diagram Symbols
Electronic Component