It is possible to specify the rates/fees for escort-related services in the currency of the service provider. On your escort bookings pages, you will now see these codes, versus the £ sign which appeared before.
The relevant abbreviations will appear on the Booking Request Form and in your booking history next to the "Proposed Fee / Will Pay" figures.
People in the UK will be using British Pounds, which is abbreviated as GBP.
A full list of the abbreviations and countries can be found here. Besides the above, other common currency codes are EUR for the Euro and AUD for Australian Dollars.