A ballpoint pen (Philippine English: ballpen, British English: biro) is a writing instrument, with an internal ink reservoir and a sphere for a point. The internal chamber is filled with a viscous ink that is dispensed at its tip during use by the rolling action of a small sphere. The sphere, usually from 0.5 mm to 1.2 mm in diameter, may be made of brass, steel, tungsten carbide, or any durable, hard (nondeformable) material.
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Famous quotes containing the word pen:
“He loved to sit silent in a corner of his club and listen to the loud chattering of politicians, and to think how they all were in his power—how he could smite the loudest of them, were it worth his while to raise his pen for such a purpose.”
—Anthony Trollope (1815–1882)