The set of all nonnegative integers is usually called the set of nonnegative integers (or natural number set). Non-negative integer sets include natural numbers such as 0, 1, 2 and 3. Mathematically, the letter "n" represents a group of non-negative integers. Non-negative integer sets include positive integers and zeros. A set of nonnegative integers is a countable set.

"n+" or "n*" is recorded as a set of all positive integers.

Mark "*" in the upper right corner of "n" or "+"in the lower right corner of "n" to indicate that zero and negative numbers are not included in the data set.

Extended data:

The representative significance of "n" in other fields:

In spoken English, n is often used to express many meanings, such as "I bought more than n phone cards" and "I only met him once and got acquainted with him".

In chemistry, chemical symbols representing elemental nitrogen also represent the number of particles and equivalent concentration (abbreviation of equivalent concentration). In organic chemistry, it also means that the methyl group is attached to the nitrogen atom, such as N- methyl propionamide, with molecular formula: CH3CH2CONHCH3.

"n" stands for neutral line in alternating current.

"n" is on the map, pointing north.

"N" In physics, the unit of force is Newton, abbreviated as cow, and represented by the symbol N.

Interpretation of other representatives of Baidu Encyclopedia -N

Baidu encyclopedia -n