Cliff D
Although shorting switches of this type are fairly available, this particular one makes 3 different types of connections. If you were to label the five terminals A through E; then the three switch positions will give you choices of A+C, B+D or C+E.
What is your application for this switch?
If you are looking for a 3 position switch that will allow you to connect a single line to your choice of 3 other lines then you might want to look at a different switch (perhaps a rotary) that offers a single terminal that can be connected to your choice of 3 or more lines one at a time.
Also you need to figure out if you need a shorting switch or a non-shorting switch as some applications will not be tolerant of shorting during switch changes.