Arc Marks
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hashmarks
They are arrow points and double arrow points
Segments of equal length are called congruent segments. You can identify them by congruency marks. congruency marks look like this on your line: ---l-----------l---
All triangles have 3 interior angles that add up to 180 degrees and the 4 interior angles of a quadrilateral add up to 360 degrees but if 2 of its vertices are joined by a diagonal this marks out 2 interior triangles each having 3 interior angles adding to 180 degrees.
Whatever marking you find on a ring marks the mounting, not the stone. The indicator 14d stamped in the metal may indicate a style, type or design.