Guilder is the English translation of the Dutch and German gulden, originally shortened from Middle High German guldin pfenninc "gold penny". This was the term that ...
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became current in the southern and western parts of the Holy Roman Empire for the Fiorino d´oro (introduced in 1252). Hence, the name has often been interchangeable with florin (currency sign ƒ or fl.).
The guilder is also the name of several currencies used in Europe and the former colonies of the Dutch Empire.