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The two dots above a letter, you mean, would be called a diaeresis and/or an umlaut.
You would put two dots on each end of a line and it becomes a line segment
A line segment would be a subset of a line. You wold draw two closed dots with a line joining them.
in German they are called umlauts
It is two dots one on top one on bottom and a line in the middle From:Maddie