The word "biros" is a common term used to refer to ballpoint pens. However, there are a number of different synonyms that can be used to describe this common writing instrument. Some of these synonyms include ballpoint, rollerball, and Bic pen. Other terms that are sometimes used to describe this type of pen include gel pen, fine liner, and felt tip pen. No matter what you call them, these pens are a ubiquitous part of daily life for many people around the world, whether they are used for taking notes, writing letters, signing documents, or just doodling.