What is "n-deterrence"

The Minimum Credible Deterrence (MCD; officially names as N-deterrence), is a defence and strategic principle on which the atomic weapons programme of Pakistan is based. This doctrine is not a part of the nuclear doctrine, which is designed for the use of the atomic weapons in a full-scale declared war if the conditions of the doctrine are surpassed. Instead, the policy of the Minimum Credible Deterrence falls under minimal deterrence as an inverse to the Mutually Assured Destruction (MAD), which is widely regarded as the designed to dissuade India from taking any military actions against Pakistan, as it did in 1971. (see: Indo-Pakistani war of 1971) Pakistan has a no first attack policy in place since 1971. This policy was reiterated after the nuclear tests in 1998. Pakistan has vowed never to invade or attack another country under any circumstances. Pakistan's foreign minister Shamshad Ahmad had warned that if Pakistan is ever invaded or attacked, it will use "any weapon in its arsenal" to defend itself.