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Sigma and pi refer to the symmetries of the chemical bonds. The symmetry is the "same" as an s orbital.
A sigma bond runs down the "axis" the orbitals that form it are two s orbitals or two axial p orbitals (usually called pz) or a pz and an s.
The pi bond has the same symmetry as the p orbitals - a positive lobe and a negative lobe.
Sorry about the explanation- its difficult to explain without getting into group theory.
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