A '''pen''' is a writing instrument which uses ink. Popular varieties include: fountain, felt-tip, ball-point, and gel.
A '''pen''' is a writing instrument which uses ink. Popular varieties include: fountain, felt-tip, ball-point, and gel.
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== History ==
== History ==
The ball point pen was invented in 1936, and over the next few decades overtook the [[fountain pen]] as the most-used writing instrument in the industrialised world.
The ball point pen was invented in 1936, and over the next few decades overtook the [[fountain pen]] as the most-used writing instrument in the industrialised world.