凸 tū to protrude
to protrude; to bulge out; convex; to stick out; protruding
How it is used
- Convex - sticking out / bulging - 凸出 (tūchū) to protrude, 凸显 (tūxiǎn) to make stand out prominently, 凸透镜 (tūtòujìng) convex lens.
- The exact opposite of 凹 (āo, concave); the pair 凹凸 (āotū) = uneven, bumpy (凹凸不平).
- The character is a pictograph of a bump - its shape is its meaning.