---
title: isSignalingNaN
framework: swift
role: symbol
role_heading: Instance Property
path: swift/float80/issignalingnan
---

# isSignalingNaN

A Boolean value indicating whether the instance is a signaling NaN.

## Declaration

```swift
var isSignalingNaN: Bool { get }
```

## Discussion

Discussion Signaling NaNs typically raise the Invalid flag when used in general computing operations.