pen

In Latin, penna meant feather. Specifically, it meant the large flight feathers from birds' wings—the feathers with shafts thick enough to hold. By the 5th century CE, scribes in the Roman Empire had developed the quill pen: a feather (usually from a goose, sometimes a raven) split at the tip and sharpened to a point, dipped in ink. The quill didn't have a name because it didn't need one. It was so obviously a feather put to use that scribes called it a penna, and that was enough.

For a thousand years, penna dominated writing. Medieval monks used quills. Renaissance scribes used quills. Ben Franklin used a quill. The feather was so essential to writing that the word never shifted—a quill was a penna, and penna meant feather-for-writing. English inherited the word from Old French plume (also from Latin penna), and by the 1300s, English had 'pen.' The feather had emigrated along with the word.

The quill's dominance was so complete that when metal pen nibs were invented in the 1800s, manufacturers didn't create a new word. They called them 'steel pens' or 'metal pens'—pens, still, because they did the work of a penna. The fountain pen came next in the 1870s. Still a pen. The ballpoint pen (invented 1938, patented by László Bíró in 1945) was just a pen with a rolling ball. The word didn't break. The feather's shadow stretched forward into the industrial age.

A ballpoint pen has nothing to do with feathers. It's plastic, metal, a tiny sphere of carbide or tungsten rolling against ink. Yet we still call it a pen. The word held. We've forgotten what we're naming, but the naming has stuck. Every time a schoolchild picks up a ballpoint 'pen,' they're holding something that has traveled from the sky to the page, from the goose's wing to plastic and metal, yet the word remains: pen. A feather, still, even now.