Piastre

Piastre is a monetary term used for several currencies and subunits in different regions and historical periods. The form is derived from the Ottoman Turkish piaster, and the word has appeared in English and other languages to refer to various coins or fractions of a main unit. In some contexts, piastre denotes a subdivision of a national currency, while in others it has stood as a principal currency unit in colonial or regional systems.

Historically, the piastre circulated as a fractional unit within the monetary systems of the Ottoman Empire and its successors, and the term was adopted in various Arabic-speaking and North African markets. It was common for currencies to be divided into 100 piastres per main unit, though practices varied by country and era. The piastre thus functioned as a convenient naming convention for small-change in many parts of the Muslim world and neighboring regions during the 19th and early 20th centuries.

In contemporary usage, several countries retain piastre as the subunit of their currency. In Egypt, the pound is divided into 100 piastres (often called qirsh in Arabic). In both Syria and Lebanon, the respective pounds are similarly subdivided into 100 piastres. Beyond the Arab world, the term was used for the Indochinese piastre in French Indochina, where it served as the principal currency unit in the late 19th and early 20th centuries before being replaced by local currencies after decolonization.

Piastre remains a historical reference in many archival sources, reflecting a shared linguistic heritage in regional monetary naming and the varied paths these currencies followed through the 20th century.