The nib size of the fountain pen determines the thickness of the lines.
nib holder
Frequency:
45
%
He carefully cleaned the nib holder before using it.
Idiomatic Expressions for nib
Phrase: nib and tuck
Meaning: a close competition or race where the outcome is uncertain until the end
Usage: The basketball game was a nib and tuck affair, with both teams tied until the final seconds.