---
title: math.NaN() function
description: The math.NaN() function returns an IEEE 754 “not-a-number” value.
menu:
  v2_0_ref:
    name: math.NaN
    parent: Math
weight: 301
---

The `math.NaN()` function returns an IEEE 754 “not-a-number” value.

```js
import "math"

math.NaN()

// Returns NaN
```