What do the 'M' and 'F' mean in Parker pens? - Quora
What do the 'M' and 'F' mean in Parker pens? - Quora
Answer (1 of 4): It's not only for Parker, M means a medium sized Nib and F means a fine sized Nib. M is sightly wider than F and is also usually more smooth. However, it's a personal choice.
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