The Oren, or orens, is the official unit of currency in those Βόρεια Βασίλεια under Temerian rule in the time of Foltest, namely:
Στο παιχνίδι The Witcher
Making the most of your orens
Uses for orens
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Στο παιχνίδι για υπολογιστή The Witcher 2: Assassins of Kings
The oren is still the currency in The Witcher 2, which is rather strange given the fact that a good deal of the game takes place in Aedirn, which uses the mark. The Collector's Edition of the game includes a metal replica of a Temerian Oren.