Switch operation terminology confusion
A X-X switch has two possible (stable, for a non-momentary switch) contact positions, or a maximum of two throws if you will.  An X-X-X switch has three possible contact positions, or a maximum of three throws, although many of them are double throw switches where the third (center) position is an OFF position. 

A "latching" switch is the same as "push-on push-off" or "push-pull" -- all of these mean that the switch does not have any momentary positions in it, although the position designator ("On-On" or whathaveyou) is the ultimate guide to this.  The manufacturer's datasheet should provide a schematic symbol or some other sort of usage documentation for the switch, as well.