N

NANO (N)
A metric prefix meaning one billionth of a unit or 10-9. See Metric Prefixes

NORMALLY CLOSED/OPEN    NC or NO
When the actuator of a switch is in its 'normal' position, it is wired to be either Open (NO) or Closed (NC). NO = an un-actuated switch: the circuit is open, and no current is flowing until you operate the switch. NC = the switch is closed, the circuit is closed, and current is flowing until you operate the switch.

NEWTON N
The newton is the SI unit of force. One newton is the force required to give a mass of 1 kilogram an acceleration of 1 meter per second per second.

It is named after the English mathematician and physicist Sir Isaac Newton (1642-1727).

More on Newton

It's also the name given to a well-known cookie created by the Kennedy Biscuit Works of Boston (now Nabisco), and named after a town near Boston.
What American has not enjoyed a Fig Newton?

NON-DYNAMIC BRAKE
See Dynamic Brake

Don't you just love those entries in conventional dictionaries that lead you on a cat-and-mouse chase from definition to definition? Sure.
It's a lot easier when you can use links...as is the case here!