| 1217 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 914 | A New Dictionary of Kanji Usage |
| 1096 | Classic Nelson (Andrew Nelson) |
| 995 | Essential Kanji (P.G. O’Neill) |
| 1155 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1796 | Japanese Names (P.G. O’Neill) |
| 1289 | Kanji and Kana (Spahn and Hadamitzky) |
| 1363 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 1228 | Kanji in Context (Nishiguchi and Kono) |
| 356 | Kodansha Compact Kanji Guide |
| 3502 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1805 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2457 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 861 | Les Kanjis dans la tete (Yves Maniette) |
| 5210 | Morohashi |
| 2823 | New Japanese English Character Dictionary (Jack Halpern) |
| 1038 | New Nelson (John Haig) |
| 853 | Remembering The Kanji (James Heisig) |
| 917 | Remembering The Kanji, 6th edition (James Heisig) |
| 1513 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in junior high
JLPT level N1
1049 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 堅 【ケン】 strength, solidity, firmness, armour, armor
- 堅持 【ケンジ】 holding on to, sticking to
- 中堅 【チュウケン】 nucleus, backbone, mainstay, key figure, medium-level, mid-level, middle-ranking, midsize, main body (of troops), crack troops, select troops, center field, centre field, center fielder, centre fielder, athlete competing in the middle-number match in a team competition, i.e. second in 3-on-3, third in 5-on-5 (kendo, judo, etc.)
- 米利堅 【メリケン】 America, American, fist
Kun reading compounds
- 硬い 【かたい】 hard, solid, tough, stiff, tight, wooden, unpolished (e.g. writing), strong, firm (not viscous or easily moved), safe, steady, honest, steadfast, obstinate, stubborn, bookish, formal, stuffy
- 堅い商売 【かたいしょうばい】 sound business
Readings
- Japanese names:
- きん
- Korean:
- gyeon
Spanish
- duro
- sólido
- firme
- apretado
- estricto
Portuguese
- de confiança
- apertado
- duro
- sólido
- firme
- estrito
French
- tenace
- dur
- strict
- solide
- ferme
- fiable
| 3472 | 2001 Kanji |
| 3b9.13 | The Kanji Dictionary |
| 2-9-3 | SKIP code |
| 2-8-3 | SKIP code |
| 7710.4 | Four corner code |
| 1-23-88 | JIS X 0208-1997 kuten code |
| 5805 | Unicode hex code |
Jōyō kanji, taught in grade 3
JLPT level N2
1307 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 炭素 【タンソ】 carbon (C)
- 炭鉱 【タンコウ】 coal mine, (coal) pit, colliery, coal-mine shaft
- 木炭 【モクタン】 charcoal
- 活性炭 【カッセイタン】 activated charcoal, activated carbon
Kun reading compounds
- 炭 【すみ】 charcoal, charred remains
- 炭火 【すみび】 charcoal fire
- 正炭 【しょうすみ】 first adding of charcoal to the fire (tea ceremony)
- 竹炭 【たけすみ】 bamboo charcoal
Readings
- Korean:
- tan
Spanish
- carbón vegetal
- carbón
Portuguese
- carvão
French
- charbon de bois
- charbon
| 274 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 361 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 341 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 1007 | A New Dictionary of Kanji Usage |
| 1418 | Classic Nelson (Andrew Nelson) |
| 842 | Essential Kanji (P.G. O’Neill) |
| 713 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1186 | Japanese Names (P.G. O’Neill) |
| 1344 | Kanji and Kana (Spahn and Hadamitzky) |
| 1427 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 875 | Kanji in Context (Nishiguchi and Kono) |
| 1267 | Kodansha Compact Kanji Guide |
| 2806 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1445 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1947 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 778 | Les Kanjis dans la tete (Yves Maniette) |
| 18953 | Morohashi |
| 2257 | New Japanese English Character Dictionary (Jack Halpern) |
| 3413 | New Nelson (John Haig) |
| 771 | Remembering The Kanji (James Heisig) |
| 833 | Remembering The Kanji, 6th edition (James Heisig) |
| 337 | Tuttle Kanji Cards (Alexander Kask) |
| 1262 | 2001 Kanji |
| 3o6.5 | The Kanji Dictionary |
| 2-3-6 | SKIP code |
| 3-5-4 | SKIP code |
| 2228.9 | Four corner code |
| 1-35-26 | JIS X 0208-1997 kuten code |
| 70ad | Unicode hex code |