Algorismus

Algorismus refers to:

The various 13th century Latin writings on the methods numerical calculation, using the then newly introduced Hindu-Arabic numerals. Well known authors who wrote about the topic are Alexander de Villa Dei and Johannes de Sacrobosco. Texts on this topic became exceedingly popular during the last few centuries of the Middle Ages, as the new way of writing numbers and using them in calculations slowly began to replace the older Roman numerals.
Algorismus, is also the title of a section of Hauksbók, a large book written and compiled by Icelanders and taken to Norway during the later part of the 13th century by Haukur Erlendsson.
Al-Khwārizmī is the name of a Persian mathematician, who wrote a book about this same topic in Arabic, several centuries before the Hindu-Arabic number system became known in Europe. It was his name that Latin authors began to read as ALGOR, that soon turned into the word Algorismus as used by Latin authors in Europe.

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