Gold parity unit of account
The gold parity unit of account was the unit of account used by the European Coal and Steel Community (ECSC) from 1958, and in the European Economic Community from 1962 until the early 1970s. The unit was fixed to the value of gold under the Bretton Woods system, and was equivalent to the US dollar which the ECSC had previously used.
Source: Wikipedia — Gold parity unit of account (CC BY-SA 4.0)