Pretty sure I am not alone, pretty sure you are referring to me, pretty sure I am correct in it’s nomenclature unless you can show me evidence otherwise?!
Hum Bucker - is bucking the hum (or cancelling) which was achieved by a split coil moving on from the single coil.
A P is a dual coil - split - a humbucker side by side is just that, and that gives you the option of running series/parallel/individual and is humbucking/cancelling. The split coil allows you to the EA-DG strings differently depending on ‘normal’ or reverse config, but some Humbuckers or soap bars also give you this split coil type option as well.
The Musicman Pick up or MM is not just for Musicman basses - it’s just been given that name - the original prototype Stingray was actually using a Split coil bass down by our Leo.
This is what I though is commonly understood information/chat, parlance is by far too complex a word for me to understand and clearly obfuscates the isuue discombobulates me.
So @Al Krow I am happy to be wrong, and if so point me in the direction to re-educate me, but I find knowing the stuff helps to make appropriate decisions and suggestions.