These terms have given rise to abbreviations for the types of switch which are used in the electronics industry such as ""single-pole, single-throw"" (SPST) (the simplest type, "on or off") or ""single-pole, double-throw"" (SPDT), connecting either of two terminals to the common terminal. In electrical power wiring (i.e., house and building wiring by electricians), names generally involve the suffix ""-way""; however, these terms differ between British English and American English (i.e., the terms "two way" and "three  way" are used with different meanings).