Arabic numerals
The first mentions of the numerals in the West are found in the "Codex Vigilanus" of 976.
Islamic world contributions to Medieval Europe
The translation of Al-Khwarizmi's work greatly influenced mathematics in Europe. As Professor Victor J. Katz writes: "Most early algebra works in Europe in fact recognized that the first algebra works in that continent were translations of the work of al-Khwärizmï and other Islamic authors. There was also some awareness that much of plane and spherical trigonometry could be attributed to Islamic authors". The words algorithm, deriving from Al-Khwarizmi's Latinized name Algorismi, and algebra, deriving from the title of his AD 820 book "Hisab al-jabr w’al-muqabala, Kitab al-Jabr wa-l-Muqabala" are themselves Arabic loanwords. This and other Arabic astronomical and mathematical works, such as those by al-Battani and Muhammad al-Fazari's "Great Sindhind" (based on the "Surya Siddhanta" and the works of Brahmagupta). were translated into Latin during the 12th century.