single pole single throw

single pole double throw

care to guess the last one

yup double pole double throw

http://www.kpsec.freeuk.com/components/switch.htm some stuff about them
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SPST is a single switch that switches a single circuit on or off by opening of closing that circuit.

SPDT is a single switch that can put one circuit in 2 different on states- ie. it can connect one pole to one of 2 others

DPDT is a dual action switch that can control 2 different circuits at once.

And as always, Wikipedia is your friend.
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