| 1667 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1921 | A New Dictionary of Kanji Usage |
| 90 | Classic Nelson (Andrew Nelson) |
| 1882 | Essential Kanji (P.G. O’Neill) |
| 1086 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 323 | Japanese Names (P.G. O’Neill) |
| 1892 | Kanji and Kana (Spahn and Hadamitzky) |
| 2068 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1921 | Kanji in Context (Nishiguchi and Kono) |
| 175 | Kodansha Compact Kanji Guide |
| 4298 | Kodansha Kanji Dictionary (Jack Halpern) |
| 2174 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2928 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 34 | Les Kanjis dans la tete (Yves Maniette) |
| 1809 | Morohashi |
| 3486 | New Japanese English Character Dictionary (Jack Halpern) |
| 443 | New Nelson (John Haig) |
| 34 | Remembering The Kanji (James Heisig) |
| 34 | Remembering The Kanji, 6th edition (James Heisig) |
| 1040 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
2143 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 凸 【トツ】 convex
- 凸凹 【デコボコ】 unevenness, roughness, ruggedness, bumpiness, inequality, imbalance, unevenness, difference
- 凹凸 【オウトツ】 unevenness, bumpiness, roughness, ruggedness, imbalance, inequality, unevenness, disparity
- 両凸 【リョウトツ】 biconvex
Kun reading compounds
- 凸 【でこ】 brow, forehead, bump
- 凸凹 【でこぼこ】 unevenness, roughness, ruggedness, bumpiness, inequality, imbalance, unevenness, difference
Readings
- Korean:
- cheol, dol
Spanish
- convexo
- desigual
Portuguese
- convexo
- ímpar
French
- convexe
- inégal
- gros sourcils
| 3675 | 2001 Kanji |
| 0a5.13 | The Kanji Dictionary |
| 4-5-1 | SKIP code |
| 4-6-1 | SKIP code |
| 4-4-1 | SKIP code |
| 7777.7 | Four corner code |
| 1-38-44 | JIS X 0208-1997 kuten code |
| 51f8 | Unicode hex code |
凹
Jōyō kanji, taught in junior high
JLPT level N1
2206 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 凹 【オウ】 concave, hollow, sunken
- 凹凸 【オウトツ】 unevenness, bumpiness, roughness, ruggedness, imbalance, inequality, unevenness, disparity
- 肋凹 【ロクオウ】 costal fovea
Kun reading compounds
- 窪む 【くぼむ】 to cave in, to become depressed, to sink
- 凹む 【へこむ】 to be dented, to be indented, to yield, to give, to sink, to collapse, to cave in, to be beaten, to be overwhelmed, to yield, to give in, to give up, to be disheartened, to feel down, to feel depressed, to suffer a loss, to lose
- 発達凸凹 【はったつでこぼこ】 developmental irregularities, developmental disorder, neurodiversity
- 穴ぼこ 【あなぼこ】 hole, hollow, pothole (road, pavement, etc.)
Readings
- Korean:
- yo
Spanish
- hueco
- cóncavo
- hundido
Portuguese
- côncavo
- concavidade
- afundado
French
- concave
- creux
- dépression
| 1032 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1920 | A New Dictionary of Kanji Usage |
| 664 | Classic Nelson (Andrew Nelson) |
| 1883 | Essential Kanji (P.G. O’Neill) |
| 1087 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1893 | Kanji and Kana (Spahn and Hadamitzky) |
| 2069 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1922 | Kanji in Context (Nishiguchi and Kono) |
| 173 | Kodansha Compact Kanji Guide |
| 4294 | Kodansha Kanji Dictionary (Jack Halpern) |
| 2170 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2924 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 33 | Les Kanjis dans la tete (Yves Maniette) |
| 1810 | Morohashi |
| 3482 | New Japanese English Character Dictionary (Jack Halpern) |
| 444 | New Nelson (John Haig) |
| 33 | Remembering The Kanji (James Heisig) |
| 33 | Remembering The Kanji, 6th edition (James Heisig) |
| 1039 | Tuttle Kanji Cards (Alexander Kask) |
| 3675 | 2001 Kanji |
| 0a5.14 | The Kanji Dictionary |
| 4-5-1 | SKIP code |
| 4-6-1 | SKIP code |
| 4-4-1 | SKIP code |
| 7777.0 | Four corner code |
| 1-17-90 | JIS X 0208-1997 kuten code |
| 51f9 | Unicode hex code |
Jōyō kanji, taught in grade 2
JLPT level N4
559 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 紙 【シ】 newspaper
- 紙上 【シジョウ】 on paper, in the newspapers, in a letter
- 原稿用紙 【ゲンコウヨウシ】 Japanese writing paper (lined with a square grid, one square per character), manuscript paper
- 製紙 【セイシ】 papermaking, paper manufacture
Kun reading compounds
- 紙 【かみ】 paper
- 紙芝居 【かみしばい】 kamishibai, storytelling with pictures, form of Japanese street theater and storytelling (popular from the 1930s to the 1950s)
- インディア紙 【インディアかみ】 India paper
- 頸上 【くびかみ】 neckband, round upright collar (on some traditional Japanese clothing)
Readings
- Korean:
- ji
Spanish
- papel
- periódico
Portuguese
- Papel
French
- papier
| 85 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 148 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 132 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 501 | A New Dictionary of Kanji Usage |
| 3510 | Classic Nelson (Andrew Nelson) |
| 362 | Essential Kanji (P.G. O’Neill) |
| 236 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1953 | Japanese Names (P.G. O’Neill) |
| 2.2 | Japanese for Busy People |
| 180 | Kanji and Kana (Spahn and Hadamitzky) |
| 180 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 243 | Kanji in Context (Nishiguchi and Kono) |
| 1517 | Kodansha Compact Kanji Guide |
| 1654 | Kodansha Kanji Dictionary (Jack Halpern) |
| 879 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1197 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1846 | Les Kanjis dans la tete (Yves Maniette) |
| 27293 | Morohashi |
| 1302 | New Japanese English Character Dictionary (Jack Halpern) |
| 4455 | New Nelson (John Haig) |
| 1829 | Remembering The Kanji (James Heisig) |
| 1971 | Remembering The Kanji, 6th edition (James Heisig) |
| 456 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 194 | Tuttle Kanji Cards (Alexander Kask) |
| 2756 | 2001 Kanji |
| 6a4.4 | The Kanji Dictionary |
| 1-6-4 | SKIP code |
| 2294.0 | Four corner code |
| 1-27-70 | JIS X 0208-1997 kuten code |
| 7d19 | Unicode hex code |