In article , says...

On a side note -

When you say "3-way" - do you mean 2-pole center thow - with center
off? A switch that can be set to 3 different physical positions?




In the US what is normally referred to as a '3 way switch' in a building
is a single pole double throw. They do no thave a middle off, but just
an off/on position like any light switch would normally have. From the
outside of the switch you could not tell the difference. They are most
often used for lights. You have a room with 2 doors. You put one
switch at each door. Then you can turn the light off and on from either
switch. That is you could walk in one door, turn the light on, walk out
the other door and turn the light off.



http://www.electrical101.com/3way-sw...-nm-cable.html

There is also a '4 way switch' . That is for more than 2 places to turn
on/off a light (or anything else). You usually put a 3 way switch at
each end of the circuit and as many 4 way switches in the middle as you
need.

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