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# typeIdentifier

A key that indicates the type of the font feature.

```
static let typeIdentifier: NSFontDescriptor.FeatureKey
```

## Discussion

The value of this key is an <doc://com.apple.documentation/documentation/Foundation/NSNumber> object specifying a font feature type such as ligature, character shape, and so on. For more information on Apple Fonts see[ Fonts for Apple platforms](https://developer.apple.com/fonts/) and the [AAT Font Feature Registry](https://developer.apple.com/fonts/TrueType-Reference-Manual/RM09/AppendixF.html).

---

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