natural number positive counting numbers (whole numbers/integers) – there is some dispute as to whether or no 0 is included in the natural numbers
nautical mile 1.852km. Unit of distance used primarily with planes and boats. One nautical mile subtends one minute at the centre of the earth, 1° = 60 nautical miles. 1nm/h = 1 knot
net the shape a solid is when it is unfolded. eg the net of a cube

net wage the take home pay after all the deductions and payments have been made
nonagon a polygon with 9 sides
numerator top part of a fraction

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