What's the difference between an artistic pen and a calligraphy pen?

From the point of view of hard pen calligraphy, you should first write with a dark-pointed iridium pen, and the art pen is a tool for writing posters. Artists should bend the nib upwards to write bigger words, which can also be considered as a western writing brush. When you don't come, you can write with a dark-pointed iridium pen or a dark-pointed gold pen, but you can't write with an art pen. Dark-pointed gold pen and dark-pointed iridium pen are daily writing tools, and art pen is a big-pointed pen for writing posters, which shows that art pen is writing posters. Usually, taking notes and copying documents are mainly based on iridium pens. Notes and documents are written in books, so the words don't need to be very big. Dark-pointed iridium pens are all F-pointed (0.5mm).