---
title: nan
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.10+]
path: kernel/1557310-nan
---

# nan

## Declaration

```occ
double nan(const char *);
```

## See Also

### Not a Number

- [nanf](kernel/1557309-nanf.md)
- [nanl](kernel/1557311-nanl.md)