The horizontal line that separates the numerator and denominator in a fraction, also called a vinculum. It represents the division operation and indicates that the numerator is to be divided by the denominator.
From Latin 'fractio' meaning 'a breaking' and 'bar' from Old French 'barre' meaning 'rod.' The horizontal line notation was popularized by Arab mathematicians in the 12th century and standardized in European mathematics by the 16th century.
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