The official currency of Transnistria is the Transnistrian ruble. Transnistria is an internationally unrecognized country. Currency has no ISO code.

Transnistria (1994) 10 Ruble (front)

The second issues in August 1994 of a new ruble consisted solely of banknotes and suffered from high inflation, necessitating the issuance of notes overstamped with higher denomination. In 2000, a new ruble was introduced at a rate of 1 new ruble = 1,000,000 old rubles. This new currency consists of both coins and banknotes.
The current exchange rate is about 10 TR to the Euro.

Transnistria is a breakaway republic within the internationally recognised borders of Moldova. Although not recognised by any state or international organisation and de jure part of Moldova, it is de facto independent and functions like a state. It is organised as a presidential republic, with its own government, parliament, military, police and postal system. Its authorities have adopted a constitution, flag, a national anthem, and a coat of arms.

Transnistria is located mostly in a strip between the Dniester River and Ukraine.

Source: Wikipedia article 'Transnistrian ruble and Wikipedia's Transnistria