It means that the numeral is to be multiplied by a thousand.
For example, X = 10 but with a line over X it would be 10,000.
A horizontal line above a numeral means that it should be multiplied by a thousand so VII with a line above it represents 7000, it can also be written as (VII)
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It indicates multiplication by a thousand
A line over a Roman numeral represents multiplication of that numeral by a thousand. For example, a line over the numeral X represents 10,000 (10 * 1000) and a line over the numeral V represents 5,000 (5 * 1000).
A bar or a line over a particular Roman numeral indicates that it is to be multiplied by a thousand.
The Roman numeral for 500,000 is |V| with a line over it. This numeral was introduced in the Middle Ages, after the end of the Roman civilisation.
Sometimes you will see a numeral with a line over it. That means to multiply it by 1000. A numeral X with a line over it means 10,000.