In NBO analysis by Gaussian I am getting BD(3) and BD(3)* . What do they mean?

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Mostafa Parandeh

The abbreviation BD denotes the bonding orbital, whereas BD* signifies the antibonding orbital

Savarimuthu vincent de paul

Thank u Sir/ Madam

I would like to get the clarification for BD(3). It represents which type of orbital and which type of transition occurs between BD(3) and BD(3)*?