Meaning & readings

convex, beetle brow, uneven

On’yomi トツ
Kun’yomi でこ

Origin

This character shows a simplified picture of something protruding upward. The top stroke represents a flat surface, and the box shape below it suggests a hollow or depression. Together they create the visual impression of an uneven surface with a bump sticking out—exactly what "convex" means. The character essentially draws what it describes: a raised point against a flat background.

凸 5 strokes

Components

  • 一 radical
  • 凵 radical

Common words

  • 凹凸 おうとつ unevenness; bumpiness
  • 凸版 とっぱん letterpress; relief printing
  • 凸凹 でこぼこ unevenness; roughness
  • 凸版印刷 とっぱんいんさつ letterpress; relief printing

Easily confused with

These look alike but are unrelated in meaning — check the stroke that differs.

Reference

Strokes
5
Kangxi radical
17
Formation type
Compound ideographic (combined meanings)
Grade
Jōyō (secondary school)
Frequency rank
#2143 (newspapers)
Former JLPT
level 1
Unicode
U+051F8