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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.
A single bond is usually a Ï bond. Pi (Ï) bonds are weaker and are due to lateral overlap between p (or d) orbitals. A double bond between two given atoms consists of one Ï and one Ï bond, and a triple bond is one Ï and two Ï bonds. Covalent bonds are also affected by the electronegativity of the connected atoms which determines the chemical polarity of the bond.