The geometric term for the tip of a pen is a "point." In geometry, a point is a location in space that has no size or dimensions, represented by a dot. It is the most fundamental element in geometry and serves as the building block for all geometric shapes and figures.
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This could vary depending on the pen, but it would most likely be a right, circular cone, frequently with the tip removed.
Point
a point, dot, hole, vagina you can use any of those 4
A point.
It is the apex or vertex