Ballpoint pen

A ballpoint pen, also known as a biro, ball pen, or dot pen, is a pen that dispenses ink over a hard ball at its point, i. e. , over a "ball point".

The materials commonly used are steel, brass, or tungsten carbide.
The design was conceived and developed as a cleaner and more reliable alternative to dip pens and fountain pens, and it is now the world's most-used writing instrument; millions are manufactured and sold daily.
It has influenced art and graphic design and spawned an artwork genre.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY 3.0

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