core + meta (Meta Extension): terms used within schema.org for schema definitions.

currency

Defined in the pending.schema.org extension.
Canonical URL: http://schema.org/currency

Thing > Property > currency

The currency in which the monetary amount is expressed (in 3-letter ISO 4217 format).

Usage: Between 1000 and 10,000 domains
Values expected to be one of these types
Text
Used on these types
DatedMoneySpecification
ExchangeRateSpecification
LoanOrCredit
MonetaryAmount
MonetaryAmountDistribution

Sources

https://github.com/schemaorg/schemaorg/issues/1253

https://github.com/schemaorg/schemaorg/issues/1698

Schema Version 3.3