---
title: math.NaN() function
description: >
  `math.NaN()` returns a IEEE 754 "not-a-number" value.
menu:
  flux_v0_ref:
    name: math.NaN
    parent: math
    identifier: math/NaN
weight: 101
---

<!------------------------------------------------------------------------------

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To make updates to this documentation, update the function comments above the
function definition in the Flux source code:

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`math.NaN()` returns a IEEE 754 "not-a-number" value.



##### Function type signature

```js
() => float
```

{{% caption %}}
For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
{{% /caption %}}


## Examples

### Return a NaN value

```js
import "math"

math.NaN()

```