What does $p_{1/2}$ and $p_{3/2}$ mean when referring to electron configuration?

I've seen sub shells and I'm assuming it has something to do with spin. I am asking this in regard to the $8p_{1/2}$ and $8p_{3/2}$ shells and the way they get filled at different energy levels?

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    $\begingroup$ See this earlier Q & A, Shape of the P1/2 Orbital $\endgroup$ – ron May 10 '17 at 3:23
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    $\begingroup$ We prefer to not use MathJax in the title field, see here for details. $\endgroup$ – Martin - マーチン May 10 '17 at 5:22
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    $\begingroup$ Essentially, spin-orbit coupling leads to the degeneracy of the 8p orbitals being lifted. ron's question has all the details. $\endgroup$ – orthocresol May 10 '17 at 12:59

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