One significant contribution of Muslim mathematicians to today's world is a system of numerals that is used by many. This refers to the development and dissemination of the Arabic numeral system, which includes the digits 0 through 9, and is the most commonly used numeral system in the world today.
While geometry and the Pythagorean theorem have historical significance with contributions from various cultures, the specific numeral system is a distinct contribution attributed to Muslim mathematicians. Negative numbers also have historical roots in various cultures, including ancient India and China, but the formal use and study of negative numbers were indeed advanced in the Islamic Golden Age. However, the numeral system remains the more widely recognized contribution.