Change name for →Qπ - please suggest!

[Arno K]

FP_RAT() in capital letters indicating a home function could be an acceptable choice, second best, when RATAPPROX is too long, I have the impression, that I very often select functions from the menus, so length doesn't matter, and when I write a program I prefer short names, so 3 letters can be hit by an arbitrary name given to some subroutine.
Arno