---
title: unknown
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/locale/currency-swift.struct/unknown
---

# unknown

A representation of an “unknown” currency, for use with transactions that don’t involve any currency.

## Declaration

```swift
static let unknown: Locale.Currency
```

## See Also

### Using common currencies

- [isoCurrencies](foundation/locale/currency-swift.struct/isocurrencies.md)