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In organic chemistry sigma bonds (Ï) are always the first bond between two atoms, resulting from overlap along the bonding axis (of hybrid orbitals), while pi bonds (Ï) are second and third bonds resulting from the overlap of p orbitals, above and below (or in front and back of) the bonding axis.
The Sigma Bond [edit]. The first, and simplest kind of overlap is when two s orbitals come together. It is called a sigma bond (sigma, or 'Ï', is the greek equivalent of 's'). Sigma bonds can also form between two p orbitals that lie pointing towards each other.