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Guarismo, the Spanish term for "digit," originates from the Arabic word "al-khwarizmi," named after the renowned Persian mathematician Muhammad ibn Musa al-Khwarizmi. Al-Khwarizmi made significant contributions to mathematics, particularly in the field of algebra, and his work had a profound influence on the development of mathematics in Europe. The term "guarismo" is a testament to the lasting impact of his legacy and the interconnectedness of knowledge across cultures.