noun, noun which may take the genitive case particle 'no'
ruling pen
A technical drawing instrument with a pair of adjustable metal blades for drawing precise ink lines. Used in drafting, cartography, and traditional manga inking.
I drew lines with a ruling pen in drafting class.
漫画家は烏口でコマの枠線を描くことがある。
Manga artists sometimes draw panel borders with a ruling pen.