Jotter n. : One who jots down memoranda.

Jotter n. : A memorandum book.

Example:
Is it possible to fit a Pilot G-2 Gel refill into a Pilot Jotter Ballpoint pen?

Taxonomy
Jotter, pen, Parker Jotter, clip, company, barrel, ballpoint pen, arrow, dome, the Parker, free encyclopedia, refill, T-Ball, metal barrel, variations, collector, choice of colors, Parker Pen Company.

Defination from the web:
Jotter is distinguished by a button and cap made of stainless steel, chrome or another metal, a stylized arrow-shaped clip, a smooth styrene ... Over many years of production, the jotter has been produced in numerous colors, some quite rare. ...