| 1520 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 2030 | A New Dictionary of Kanji Usage |
| 2134 | Classic Nelson (Andrew Nelson) |
| 1413 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1479 | Japanese Names (P.G. O’Neill) |
| 1929 | Kanji and Kana (Spahn and Hadamitzky) |
| 2114 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1933 | Kanji in Context (Nishiguchi and Kono) |
| 999 | Kodansha Compact Kanji Guide |
| 3414 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1759 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2394 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1181 | Les Kanjis dans la tete (Yves Maniette) |
| 14297 | Morohashi |
| 2746 | New Japanese English Character Dictionary (Jack Halpern) |
| 2477 | New Nelson (John Haig) |
| 1173 | Remembering The Kanji (James Heisig) |
| 1257 | Remembering The Kanji, 6th edition (James Heisig) |
| 1448 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
1998 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 曹 【ソウ】 palace room for government officials, fellow, set (of people), clan, family
- 曹灰硼石 【ソウカイホウセキ】 ulexite
- 法曹 【ホウソウ】 legal profession, judicial officer, lawyer, attorney
- 海曹 【カイソウ】 petty officer (navy)
- 曹司 【ゾウシ】 palace room for government officials or ladies in waiting, room inside a palace or private estate allocated to employees, person living in such a room, boarding house for trainee administrators (ritsuryō period)
Readings
- Korean:
- jo
Spanish
- cadete
- amigo
Portuguese
- caçula
- amigo
French
- élève officier
- sous-officier
- ami
- fils de bonne famille
| 1978 | 2001 Kanji |
| 4c7.10 | The Kanji Dictionary |
| 2-7-4 | SKIP code |
| 5560.6 | Four corner code |
| 1-33-66 | JIS X 0208-1997 kuten code |
| 66f9 | Unicode hex code |
Jōyō kanji, taught in junior high
JLPT level N1
1618 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 洞 【ドウ】 sinus, cavity, antrum, neighborhood (administrative division in North Korea)
- 洞察 【ドウサツ】 discernment, insight
- 空洞 【クウドウ】 cavity, hollow, cave, cavern, hollow
- 風洞 【フウドウ】 wind tunnel
Kun reading compounds
- 洞 【ほら】 hollow, cavity, hole, cave
- 洞穴 【ほらあな】 cave, cavern, den, grotto
Readings
- Japanese names:
- とう
- Korean:
- dong, tong
Spanish
- cavidad
- hueco
- excavación
- prever
Portuguese
- gruta
- caverna
- escavação
French
- antre
- grotte
- excavation
| 1661 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1756 | A New Dictionary of Kanji Usage |
| 2546 | Classic Nelson (Andrew Nelson) |
| 1468 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 821 | Japanese Names (P.G. O’Neill) |
| 1301 | Kanji and Kana (Spahn and Hadamitzky) |
| 1380 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1844 | Kanji in Context (Nishiguchi and Kono) |
| 1191 | Kodansha Compact Kanji Guide |
| 455 | Kodansha Kanji Dictionary (Jack Halpern) |
| 280 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 340 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 183 | Les Kanjis dans la tete (Yves Maniette) |
| 17386 | Morohashi |
| 380 | New Japanese English Character Dictionary (Jack Halpern) |
| 3125 | New Nelson (John Haig) |
| 181 | Remembering The Kanji (James Heisig) |
| 193 | Remembering The Kanji, 6th edition (James Heisig) |
| 1276 | Tuttle Kanji Cards (Alexander Kask) |
| 349 | 2001 Kanji |
| 3a6.25 | The Kanji Dictionary |
| 1-3-6 | SKIP code |
| 3712.0 | Four corner code |
| 1-38-22 | JIS X 0208-1997 kuten code |
| 6d1e | Unicode hex code |
Jōyō kanji, taught in junior high
JLPT level N1
1902 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 禅 【ゼン】 dhyana (profound meditation), Zen (Buddhism)
- 禅寺 【ゼンデラ】 Zen temple
- 吹禅 【スイゼン】 Zen blowing meditation (performed with shakuhachi)
- 如来禅 【ニョライゼン】 Zen Buddhism based on the original teachings of Buddha
Readings
- Korean:
- seon
Spanish
- Zen
- meditación
Portuguese
- Zen
- meditação silenciosa
French
- Zen
- méditation
| 1502 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1551 | A New Dictionary of Kanji Usage |
| 3255 | Classic Nelson (Andrew Nelson) |
| 1063 | Essential Kanji (P.G. O’Neill) |
| 1580 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1886 | Japanese Names (P.G. O’Neill) |
| 1540 | Kanji and Kana (Spahn and Hadamitzky) |
| 1642 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 589 | Kanji in Context (Nishiguchi and Kono) |
| 1426 | Kodansha Compact Kanji Guide |
| 1306 | Kodansha Kanji Dictionary (Jack Halpern) |
| 708 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 947 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1949 | Les Kanjis dans la tete (Yves Maniette) |
| 24787P | Morohashi |
| 1032 | New Japanese English Character Dictionary (Jack Halpern) |
| 4104 | New Nelson (John Haig) |
| 1930 | Remembering The Kanji (James Heisig) |
| 2080 | Remembering The Kanji, 6th edition (James Heisig) |
| 1654 | Tuttle Kanji Cards (Alexander Kask) |
| 655 | 2001 Kanji |
| 4e9.2 | The Kanji Dictionary |
| 1-4-9 | SKIP code |
| 3225.6 | Four corner code |
| 3925.6 | Four corner code |
| 1-33-21 | JIS X 0208-1997 kuten code |
| 7985 | Unicode hex code |