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* This joke is for everyone who’s ever loved (or hated) the quantization of total angular momentum, J. The z-component of total angular momentum is denoted by Jz.
For a given j (the quantum number that characterizes the magnitude of total angular momentum as J=ℏ√j(j+1) ), Jz can have 2j+1 different values.
* In case you don’t really follow pop-culture, the joke refers to Jay-Z’s song “99 Problems,” which has the infamous chorus line: “I got 99 problems but a bi*ch ain’t one”.