■ radical
hū
interrogative or exclamatory final particle
How it’s built
Depicts air flowing from breath. Based on the original meaning "exhale", now written as 呼. The current meaning is a phonetic loan.
◎
iconic
characterless component — Depicts air coming out of the mouth.
丂
meaning
breath
Through the ages
Appears in
Characters that use 乎 as a component, most common first.