While algorism specifically denotes decimal calculation, an algorithm refers more broadly to any step-by-step procedure for solving a problem.
The word is a Latinization of the name of the 9th-century Persian mathematician al-Khwarizmi , whose work introduced decimal arithmetic to Europe. algorism
Over time, "algorism" was largely replaced by the word " algorithm " due to a "pseudo-etymological" confusion with the Greek word arithmós (number). While algorism specifically denotes decimal calculation