Diplomate of National Board, an Indian credential for healthcare providers (see http://www.natboard.nic.in).

Did Not Bat, a term in the sport of Cricket

Drum and Bass, an electronic music style.

Departure from nucleate boiling see heat transfer.

The Dictionary of National Biography, notable figures from British history.

Den norske Bank, a Norwegian bank (from 2003 DnB NOR).

De Nederlandsche Bank, the Dutch central bank.

Deutsche Nationalbibliothek, the German national library.