It is a bond is which 3 atoms are bonded together but the electrons in sharing are only 2.

It generally occurs in B2H6 because the valency of B in BH3 is not fulfilled.

these bonds are also called banana bonds.

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A 3-center 2-electron (3c–2e) bond is an electron-deficient chemical bond where three atoms share two electrons. The combination of three atomic orbitals form three molecular orbitals: one bonding, one non-bonding, and one anti-bonding. The two electrons go into the bonding orbital, resulting in a net bonding effect and constituting a chemical bond among all three atoms. In many common bonds of this type, the bonding orbital is shifted towards two of the three atoms instead of being spread equally among all three. An example of a 3c–2e bond is the trihydrogen cation H+3. This type of bond is also called banana bond.