# Number - NaN (Not A Number)

> (Data|State) Management and Processing > (Data Type|Data Structure) > Number, Numeric, Quantity

### Table of Contents

## 1 - About

NaN, or Not a Number, is a value that returns when impossible things are asked in arithmetic – like:

- divide zero by zero.
- or during the bad coercion

NaN (paradoxically named `not a number`

) is a special floating-point value in the IEEE floating-point standard.

## 2 - Articles Related

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## 3 - Management

### 3.1 - Not equal to itself

The IEEE floating-point standard requires that NaN must be treated as unequal to itself.

Demo in Javascript:

console.log(NaN === NaN); // false