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What is the name of the horizontal division line? Is there a name for it other than "division line?

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closed as off-topic by RegDwigнt Sep 5 '13 at 20:44

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Wikipedia article on division, the very first sentence in the very first subsection: "Division is often shown in algebra and science by placing the dividend over the divisor with a horizontal line, also called a vinculum or fraction bar, between them." –  RegDwigнt Sep 5 '13 at 20:47
    
This symbol is in some places referred to as a lemnisc –  New Alexandria Sep 7 '13 at 2:01

3 Answers 3

up vote 6 down vote accepted

Vinculum is a word used broadly to describe any horizontal line in mathematical symbols. The line between numerator and denominator, the line above the recurring decimal, etc are some examples of vinucula.

More commonly, the line is called a fraction or division bar.

On a related note, the '/' sign denoting division in a/b is called a solidus and the ÷ sign in a÷b is called an obelus.

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Oops, I find I have repeated others' answers here. Sorry, I didn't see them when adding this answer. –  Bravo Sep 5 '13 at 20:25
    
Your answer may have echoed what others said, but it is arguably the best of the answers, since it offers more detailed information than the others. I for one did not know that the line above recurring decimals was also called a vinculum. (The correct plural is vincula, though; not *vinculi) –  Janus Bahs Jacquet Sep 5 '13 at 21:25

The horizontal line is called a: Vinculum

DEF: A vinculum is a horizontal line used in mathematical notation.

I think you'll find that the term is infrequently used and it's more likely someone would say x over y or x divided by y

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the line between the numerator and denominator is known as the fraction bar or division bar

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