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The horizontal bar in a fraction is called a vinculum or, informally, a "fraction bar".

Q: What do you call the horizontal bar in a fraction?

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fraction bar

The fraction form is just that - 4/7. You would usually use a horizontal bar to separate the 4 and the 7.

Now why do you suppose we say "over" in that description ? Could it be because the fraction has the '5' written 'over' the '12', with a horizontal bar between them ?

vinculum

900000=CM with horizontal bar above it 90000=XC with horizontal bar above it 9000=MX with horizontal bar above X only 900=CM Therefore: ............_____..._ 999900=CMXCMXCM

Related questions

There is no vertical bar in a fraction. A fraction is written with either a horizontal bar or a slanted bar, which is technically called a "vinculum", but most people call it a "fraction bar".

In any proper or improper fraction such as 3/4, the fraction bar, when shown as being horizontal, is called the vinculum. When shown as being slanted, it is called a solidus.

The "fraction bar" that we usually call it is actually called the vinculum.

fraction bar

It is a [horizontal] bar chart.It is a [horizontal] bar chart.It is a [horizontal] bar chart.It is a [horizontal] bar chart.

The fraction form is just that - 4/7. You would usually use a horizontal bar to separate the 4 and the 7.

If you are talking about the fraction bar in mathematics, the "fraction bar" is the real name. It is sometimes called a vinculum (although this is a misuse of the word). The fraction bar in amateur radio, also known as the forward slash is officially known as the "fraction bar."

fraction bar

a fraction bar is the horizontal line in a fraction ex: a/b t/r 1/3 2/4 3/5 4/6 5/7 6/8 7/9 8/1 r _ s

Now why do you suppose we say "over" in that description ? Could it be because the fraction has the '5' written 'over' the '12', with a horizontal bar between them ?

Vertical Split Bar

vinculum