Martin Eastburn wrote in
:

When you have set the teeth goes side to side.
An unset blade the teeth are full width and at most wave or are in
line. The hacksaw blade is one example of a wave blade.

You appear to have a unique definition of "set". Since
your definition is different from everyone else's, your
comments are hard to understand.

Hacksaw blades have set. It's not alternate tooth set as
would be done on a crosscut or ripsaw for wood, but the
teeth are still set.

The teeth on a rip saw are full width of the blade.

So are the teeth on a crosscut saw. As you say they are
triangles (viewed from the top), the trailing edge of the
triangle is full width of the blade.

John