凸 means “convex, bump”

とつ · totsu

Also: beetle brow, uneven

Kun'yomi (Japanese reading)

でこ

On'yomi (Chinese reading)

トツ

JLPT N1 · Taught in secondary school · 5 strokes

The story

A shape that draws itself: a block with a bump rising from the top. 凸 is convex, a 凸レンズ gathers light, and paired with its twin as 凸凹, dekoboko, it describes a bumpy road or a 凸凹コンビ, a mismatched duo.

Used in 凸凹 (dekoboko, bumpy/uneven), 凸レンズ (totsu renzu, convex lens), and 凹凸 (outotsu, unevenness)

More from Shapes & Angles

• 凹 concave
• 弧 arc
• 隙 gap
• 環 ring
• 枠 frame
• 端 edge
• 距 distance
• 圏 sphere
• 縦 vertical
• 緯 latitude
• 径 diameter
• 斜 diagonal

Learn 凸 and more kanji free on Fuji Learning · All kanji

Readings from KANJIDIC2, © EDRDG, CC BY-SA.