Dot (noun)

1. A small round mark made by a pen or pencil.
2. A small, round shape, especially one made by a point or a small circular object.

Origin:

From middle english dot, from old english dott ("spot, dot"), from proto-germanic *duttaz ("spot, dot"), from proto-indo-european *dew- ("to smudge, smear").

Examples:

1. He put a dot on the map.
2. The dress had polka dots.
3. She made a dot on the paper.
4. The dot on the radar screen indicated the location of the enemy.
5. The graph had dots showing the data points.