Why do we call the basic oscillators by "circle, triangle, square, rectangle, sawtooth"?
- The oscillators were named after their inventors.
I've not heard of a ... Mr. Sawtooth ... before.
- The oscillators sound like these shapes.
What does a shape sound like?
- There is no correlation, these are just names.
There is a common reason for the naming.
- The oscillators visually look like these shapes.