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The Tunisian duro is the nickname of the small silver coin that is part of the Tunisian currency. The value of the coin is five millimes or 0.005 of a Tunisian dinar, and is the smallest denomination currently being minted (smaller 1 and 2 millime coins are no longer issued). These coins can be found on the ground since they don't have value.
References
Tunisian duro Wikipedia(Text) CC BY-SA