It is an indication that the string of digits under the horizontal line repeats for ever.
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The equation of any horizontal line isY = a number .
On the Cartesian plane the horizontal number line is the x axis.
It means recurring, so rather than writing out an endless line of 3s, 3.333333333333 etc they would write the 3.333 with the last 3 having a line over it.
Rounded to the nearest hundredth, it is 2.33. However, it is an irrational number with an infinite number of threes behind the decimal point (2.33333...) so it technically is 2.3 with a small horizontal line over the 3.
1. As a decimal value, write: .3 (with a horizontal line above the 3 or by writing (repeating)) 2. As a percentage, write: 33.3% or 33.3 percent (with a horizontal line above the 3 that is to the right of the decimal point or by writing (repeating))