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Greek letters naming how orbitals overlap in a bond.
Also known as: Pi bond, Sigma bond
Sigma and pi name how the orbitals forming a bond overlap: end-on for sigma and side-on for pi. A double bond is one of each rather than two of the same, which is why the two halves of a double bond behave differently.
Name the type of orbital overlap in a covalent bond, end-on for sigma and side-on for pi.
Contexts: Laboratory
Make a double bond one sigma and one pi rather than two identical bonds, which is why the pi component is the reactive one.
Contexts: Laboratory
Lowercase Greek letters printed beside a drawn bond or in a text description of it.