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m subscript l is the third quantum number known as the magnetic quantum number. It distinguishes the the individual orbitals within a subshell (tells us the number of orbitals and their orientation. It can have the values l, l-1, ... , -l.
Just like what the others said, m with the subscript l is the magnetic quantum number which describes an orbital's orientation. It can be found from the angular momentum (l). If l was 1 for example, then the possible ml values would be -1, 0, and 1.
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