The Dassault Mirage 2000N is a variant of the Mirage 2000 designed for nuclear strike. It forms the core of the French air-based tactical nuclear deterrent. The Mirage 2000D is its conventional attack counterpart.
Dassault has also developed the Mirage 2000D, which is a development of the Mirage 2000N designed for long-range precision strikes with conventional weapons. This aircraft is exactly the same as the Mirage 2000N, but introduces support for conventional attack missiles such as the Apache and Scalp missiles, as well as the AASM weapons. The first aircraft, converted from the Mirage 2000N prototype, flew on 19 February 1991, and the French Air Force ordered a total of 86 aircraft.
Извор: Dassault Mirage 2000D on Wikipedia