Tunisian dinar
The dinar (, , ISO 4217 currency code: "TND") is the currency of Tunisia. It is subdivided into 1000 milim or millimes (). The abbreviation "DT" is often used in Tunisia, although writing "dinar" after the amount is also acceptable (TND is less colloquial, and tends to be used more in financial circles); the abbreviation "TD" is also mentioned in a few places, but is less frequently used, given the common use of the French language in Tunisia, and the French derivation of "DT" (i.e., "").
Tunisian rial
The rial was issued by the Ottoman rulers of Tunis. Although known as the piastre by Europeans, it was not equal to the Turkish kuruş, also known as the piastre. From 1855, the rial was on a bimetallic standard of 1 rial = 0.17716 grams pure gold or 2.7873 grams pure silver. In 1887, the gold content of the 25 rial coin was slightly reduced to make it equivalent to 15 French francs. In 1891, this conversion rate (more conveniently expressed as 1 rial = 60 centimes) was used when the Tunisian franc replaced the rial.