What do the Ms in ml and ms quantum numbers stand for?

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Stickybees

I first thought magnetic, but that only makes sense for ml, they're both projections though, does anyone know what they stand for?

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dauto

m stands for magnetic
s stands for spin
l stands for ?

Keep in mind that these are just labels of at most historical significance.

Stickybees

I think it must just be 'momentum' from searching a bit more.

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