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How ش‎ led to X, and the Islamic origin of Algebra (Al-Jibr)

In this short but succinct TED talk, speaker Terry Moore discusses the Islamic origins of Alegbra, one of the many contributions of the Muslim world, and how the word itself is borrowed from the Arabic original Al-Jibr.

Arabic letter ش‎ (Sheen)
YouTube.com

In a humorous and entertaining manner, the speaker explains why x is the unknown, and how it came into being from the Arabic letter ش‎ (Sheen).