a type of switch consisting of one input contact and one output contact. (input the abbreviation only)

The abbreviation for a type of switch consisting of one input contact and one output contact is SPST, which stands for "Single Pole, Single Throw." This type of switch is commonly used in electrical circuits to control a single device by connecting or disconnecting the power supply. The "single pole" refers to the fact that there is one input contact that connects to the power source, while the "single throw" indicates that there is one output contact that connects to the device being controlled. SPST switches are typically used for simple on/off applications, making them fundamental components in various electronic devices and systems.