Nautical Star - The nautical star is a common style of tattoo even though its meanings and origins are unclear. It is a five pointed star with one half of each point in shade. It can mean a 'lucky return'.
Nazi Symbol - The Nazi symbol is depicted as the outstretched wings of an eagle holding a wreath with the swastika inside. It is a very striking image which is only really used by groups aligned with neo Nazi links.
Niho Mano - This is a Hawaiian symbol shown as opposing lines of pyramids that takes on the appearance of teeth of a shark. It is traditionally worn by males as an armband.
Nuclear Radiation - This is an internationally recognized symbol warning of the danger of nuclear radioactivity. Its use of a tattoo can mean serve as a 'warning' to others not to get to close.