Black Dot

An early transillumination finding in the scrotum in patients with torsion of the testicular appendix—a normal persistent embryologic remnant; the black dot may be seen before major edema appears
References in classic literature ?
All that could be seen of him was a very small black dot moving swiftly on the blue surface of the water, a little black dot which now and then lifted a leg or an arm in the air.
Far away, a black dot, we could see a vehicle moving in our direction.
Toward evening of the second day they reached a sandy plain where walking was difficult; but some distance before them they saw a group of palm trees, with many curious black dots under them; so they trudged bravely on to reach that place by dark and spend the night under the shelter of the trees.
The black dots grew larger as they advanced and although the light was dim Dorothy thought they looked like big kettles turned upside down.
Her gray felt hat had a white feather on it, and a white tissue veil with large black dots made her delicate skin look brilliant.
He had a large watchchain, and strong black dots where his beard and whiskers would have been if he had let them.
Then I seemed to see a row of black dots appear along that ridge -- human heads?
There is also a mysterious unlabeled black dot in his earlier observations of January 6, 1613, which is in the right position to be Neptune.
Experts warned of the dangers of gazing directly at the sun without special protection as Venus, the Earth's closest planetary neighbour, appeared as a sharply defined black dot and slowly moved from left to right.
During this miniature version of a solar eclipse, Venus appears as a black dot against the roiling solar surface.