The following two conventions for defining direction are very common, but what are they called?
Background: I'm writing a function that converts direction from one convention to the other, and struggle to come up with a good and clear name for it.
For a "0 at north, clockwise" variable or function, consider labeling it as Cardinal, as the following article on Cardinal Directions discusses the very degree notation you've just described: https://en.wikipedia.org/wiki/Cardinal_direction#:~:text=The%20ordinal%20directions%20(also%20called,%2C%20and%20northwest%20(NW) .
For "0 at positive x-axis," counterclockwise, I would label it as Cartesian, as it mimics the the X-Y plane most often used in math classrooms. https://en.wikipedia.org/wiki/Cartesian_coordinate_system
