丨 Radical 2 — a vertical stroke; a line drawn straight down
gǔn (third tone, dipping)
a vertical stroke; a line drawn straight down
Radical 21 stroke1 characters
Where the shape comes from
Not a word anyone speaks — it is the downward stroke itself, which the Shuowen glosses as movement up and down a line. It survives only as an index heading, and it takes characters built on a strong central axis: 中, 丰, 串.