Ballpoint pen

A ballpoint pen, in many countries also eponymously called a biro, is a writing instrument, more specifically a pen, similar to a pencil in size and shape.

Related Topics:
Eponym - Writing - Pen - Pencil

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The pens have an internal chamber filled with a viscous ink that is dispensed at the tip during use by the rolling action of a small metal sphere (0.7 mm to 1 mm in diameter); the ink dries almost immediately after contact with paper.

Related Topics:
Viscous - Ink - Paper

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Inexpensive, reliable and maintenance-free, they have almost completely replaced the fountain pen.

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