British vehicle registration for Manchester
• (USA ) Narcotics Anonymous
• (USA ) National Academician
• National Archives
• Nautical Almanac
• naval architect
• naval attaché
• naval auxiliary
• international vehicle registration for Netherlands Antilles
• Engineering neutral axis
• Banking new account
• Biochem. nicotinic acid
• Med. Nomina Anatomica (Latin: Anatomical Names; official anatomical terminology)
• Biochem. noradrenaline
• North America(n)
• Optics numerical aperture
• nursing auxiliary