---
title: unknown
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsaccessibility-swift.struct/rulerunitvalue/unknown
---

# unknown

The units are unknown.

## Declaration

```swift
static let unknown: NSAccessibility.RulerUnitValue
```

## See Also

### Units

- [centimeters](appkit/nsaccessibility-swift.struct/rulerunitvalue/centimeters.md)
- [inches](appkit/nsaccessibility-swift.struct/rulerunitvalue/inches.md)
- [picas](appkit/nsaccessibility-swift.struct/rulerunitvalue/picas.md)
- [points](appkit/nsaccessibility-swift.struct/rulerunitvalue/points.md)