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WAIT!! I screwed up & said the same thing twice!! Lee had it more or less right the first time. The switch Lee described is a Single Pole, Triple Throw switch with the #2 terminal not used. On other words, it's a Single Pole, Double Throw with a dedicated "Off" position. A pole is the circuit, a throw is the number of switching actions the unit makes. you can have a Single Pole, Quadruple Throw switch. There's one "hot" (common) that can be switched to any one of 4 other loads, but only one of the loads can be energized at once.
The circuit I incorrectly described as Double Throw, Single Pole is actually a Double Pole, Single Throw switch. It is two separate circuits controlled by one lever or button, like a two pole breaker.
Thanks for pointing that out, Doober!!
Tommy