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Over a whole number it was to ensure that it was understood as a number and not a word (also often underlined as well so the number appears between two lines);

Otherwise multiply it by 1000, for example:

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V = 5 x 1,000 = 5,000

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When there is a straight line (known as a vinculum) over a Roman numeral, it typically signifies multiplication. It indicates that the value of that Roman numeral should be multiplied by the number below the vinculum.

Q: What does it mean when there is a straight line over a roman numeral?

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It indicates multiplication by a thousand

A bar or a line over a particular Roman numeral indicates that it is to be multiplied by a thousand.

It is: 5 = V as a Roman numeral

This is not a valid roman numeral!

LXXVI is the Roman numeral for 76.

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It indicates multiplication by a thousand

In todays modern usage of Roman numerals it indicates multiplication by a thousand.

A bar or a line over a particular Roman numeral indicates that it is to be multiplied by a thousand.

It is: 5 = V as a Roman numeral

This is not a valid roman numeral!

The Roman numeral of DXIII is equivalent to 513

LXXVI is the Roman numeral for 76.

You mean Roman Numeral? It is XVI

It is the Roman Numeral for the number 6. It is the Roman Numeral for the number 6.

XXL is not a valid roman numeral.

The Roman numeral CCLXVI represents the number 266

The Roman numeral MMDCXLI represents the number 2641