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.
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A straight horizontal line is a line that goes sideways, often represented by the equation y=a where a is any real number.
What it means is horizontal line is like the horizon it goes across
The one that runs left to right, you mean..
It means "number."
That means the line is horizontal. It runs parallel to the X axis.