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It is just to indicate the specific orbital within a sub shell. Normally, you would just write p3, but if you wanted to specify that there are three different orbitals lying along the x,y,z axis, then you would write px py pz. Both are acceptable unless otherwise stated.
Px, Py, and Pz are simply the three orbitals in the P subshell (the three horizontal lines we draw). You don't necessarily need to write them out; usually we would just write P2, P3, etc. P(however many electrons are in the P subshell).
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