Illustrated Glossary of Organic Chemistry

p orbital: An atomic orbital having two orbital lobes, and an orbital node at the nucleus. Labeled according to the parallel Cartesian coordinates axis: the px atomic orbital lies along the x-axis, py lies along the y-axis, and pz lies along the z-axis.

2pz atomic orbital.
The 2px (blue), 2py (red), and 2pz
(gray)atomic orbitals are orthogonal.