Jotter

The Parker Jotter is the Parker Pen Company's first and bestselling retracting refillable ballpoint pen. Later they added a fountain pen, mechanical pencil and rollerball pen that match its design. As with many other ballpoint pens, it can be turned into gel pen if its cartridge is changed. Since 1954, over 750 million have been sold worldwide. Its refill, called T-Ball (T is for tungsten), is the first textured ballpoint and is now a standard in the industry. Also, the external design of the T-Ball is a standard design for many brands of refillable pens.