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

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

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

Keep in mind that these are just labels of at most historical significance.
 
I think it must just be 'momentum' from searching a bit more.
 

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