Original: A ballpoint pen ( also eponymously known in British English and Australian English as a biro and bye-roe in Britain and Australia but sometimes bee-roh '' elsewhere , named after its credited , though contested , inventor László Bíró ) , is a modern writing instrument .
Simplified: A ballpoint pen ( also called a biro - pronounced '' BY-roe '' - in British English after its inventor László Bíró ) , is a modern kind of pen for writing .