How can you tell a ball pen is a ball pen?

Question

How can you tell a ball pen is a ball pen?

Answer 1

A ball point pen has a ball at the tip. Others dont. Try writing upside down with it. It will soon stop writing as the ink is gravity fed.

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Answer 2

when you try to look at the tip of the ball pen there is a small ball that enables you to write freely

Answer 3

When it looks and write like a ball pen.