---
title: key
framework: coreml
role: symbol
role_heading: Instance Property
path: coreml/mlparameterdescription/key
---

# key

The key for this parameter description value.

## Declaration

```swift
var key: MLParameterKey { get }
```

## See Also

### Describing the model parameter

- [defaultValue](coreml/mlparameterdescription/defaultvalue.md)