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currency

A Schema.org Property
The currency in which the monetary amount is expressed.

Use standard formats: ISO 4217 currency format, e.g. "USD"; Ticker symbol for cryptocurrencies, e.g. "BTC"; well known names for Local Exchange Trading Systems (LETS) and other currency types, e.g. "Ithaca HOUR".
Values expected to be one of these types
Text
Used on these types
ExchangeRateSpecification
LoanOrCredit
MonetaryAmount
MonetaryAmountDistribution

Source

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