---
title: invalid
framework: os
role: symbol
role_heading: Type Property
path: os/ossignpostid/invalid
---

# invalid

A signpost identifier that indicates an error.

## Declaration

```swift
static let invalid: OSSignpostID
```

## See Also

### Getting Signpost Identifiers

- [exclusive](os/ossignpostid/exclusive.md)
- [null](os/ossignpostid/null.md)