There are several synonyms for the term "gold par of currency", which refers to the value of a country's currency relative to gold. One synonym is the "gold standard", which is a monetary system where a country's currency is pegged to the value of gold, allowing for easy conversion between currency and gold. Another synonym is the "gold exchange standard", which is a modified version of the gold standard where currencies can be redeemed for gold only by the central bank. Finally, there is the "gold reserve system", where a country holds gold reserves as a means of backing its currency and maintaining its value.