What does N stand for?

Refractive Index

(ASTM D 1218) number indicating the angle through which a ray of light is deflected as it passes through a solid or fluid medium; the number that expresses the ratio of the sine of the angle of incidence to the sine of the angle of refraction. Typically used for monitoring water-based fluids or solutions. The ratios of the velocities of light in a medium and in air under the same conditions. Measured by the ratio of the sines of the angles of incidence and refraction.

Newline

In computing, a newline, also known as a line ending, end of line (EOL), or line break, is a special character or sequence of characters signifying the end of a line of text. The actual codes representing a newline vary across operating systems, which can be a problem when exchanging text files between systems with different newline representations.

Newman Number

Newcomb Number

Nourishment

Natural Numbers

New

Nano

Nano is the prefix associated with x10^-9 and is denoted by the symbol n.

Ninja

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