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# Locale.IdentifierType

A type that indicates the standard that defines a locale’s identifier.

```
enum IdentifierType
```

## Topics

### Standard Identifier Types

[`case icu`](/documentation/Foundation/Locale/IdentifierType/icu)

The type of identifiers that follow ICU (International Components for Unicode) conventions.

[`case cldr`](/documentation/Foundation/Locale/IdentifierType/cldr)

The type of identifiers that follow CLDR (Common Locale Data Repository) conventions.

[`case bcp47`](/documentation/Foundation/Locale/IdentifierType/bcp47)

The type of BCP 47 language identifiers.

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`Sendable`](/documentation/Swift/Sendable)

[`Hashable`](/documentation/Swift/Hashable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

---

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