DIYbanter - View Single Post - Advice please - 3 way light switches

In article ,
says...

#1 "up" & #2 "up" = off. Otherwise SPST switches would work (and
you coudn't turn the light both on and off from either end).

S #1 "up" S #2 "down"
S #1 "down" S #2 "up"

or Switch #2 "

A switch circut with two spdt switches has two on states,
and two off states. I like them set up so the
light is on whenever the two switches are in the same
position.

Certainly, but Larry had three "on" states and only one "off" state
(which could be done with parallel SPST switches). "Three-way"
certainly is a curious terminology.

--
Keith