| 2 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 2 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 61 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 6 | A New Dictionary of Kanji Usage |
| 273 | Classic Nelson (Andrew Nelson) |
| 2 | Essential Kanji (P.G. O’Neill) |
| 9 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 4 | Japanese Names (P.G. O’Neill) |
| 1.A | Japanese for Busy People |
| 3 | Kanji and Kana (Spahn and Hadamitzky) |
| 3 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 2 | Kanji in Context (Nishiguchi and Kono) |
| 31 | Kodansha Compact Kanji Guide |
| 2421 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1224 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1688 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 2 | Les Kanjis dans la tete (Yves Maniette) |
| 247 | Morohashi |
| 1922 | New Japanese English Character Dictionary (Jack Halpern) |
| 72 | New Nelson (John Haig) |
| 2 | Remembering The Kanji (James Heisig) |
| 2 | Remembering The Kanji, 6th edition (James Heisig) |
| 11 | The Kanji Way to Japanese Language Power (Dale Crowley) |
| 2 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in grade 1
JLPT level N5
9 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 二 【ニ】 two, 2
- 二院 【ニイン】 the two houses of legislature
- 一二 【イチニ】 the first and second, a few
- 十二 【ジュウニ】 twelve, 12, queen
- 次男 【ジナン】 second son
- 二黒 【ジコク】 second of nine traditional astrological signs (corresponding to Saturn and southwest)
- 不二 【フジ】 being two sides of the same coin, being the same (while appearing different), Very sincerely yours, peerless, unparalleled, unparallelled
- 唯一不二 【ユイイツフジ】 one and only, unique
Kun reading compounds
- 二 【に】 two, 2
- 二重 【にじゅう】 double, two-fold, two layers, duplex, diplo-, dipl-, double-edged eyelid, double eyelid, creased eyelid
- 二つ 【ふたつ】 two
- 二つ目 【ふたつめ】 one after next, second
- 再び 【ふたたび】 again, once more, a second time
Readings
- Japanese names:
- おと、 つぐ、 つぎ、 にい、 は、 ふ、 ふたつ、 ふだ、 わ
- Korean:
- i
Spanish
- dos
- 2
Portuguese
- dois
French
- deux
- radical deux (no. 2)
| 3072 | 2001 Kanji |
| 0a2.1 | The Kanji Dictionary |
| 2-1-1 | SKIP code |
| 1010.0 | Four corner code |
| 1-38-83 | JIS X 0208-1997 kuten code |
| 4e8c | Unicode hex code |
nucleus, core, kernel
- On:
- カク
Jōyō kanji, taught in junior high
JLPT level N1
475 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 核 【カク】 stone (of a fruit), pit, pip, core (of an organization, team, etc.), nucleus, heart, nuclear weapons, nucleus (of an atom), nucleus (of a cell), condensation nucleus, (planetary) core, ring (in a cyclic compound), kernel, core, nucleus (of a cultured pearl)
- 核家族 【カクカゾク】 nuclear family
- 中核 【チュウカク】 kernel, core, nucleus, center, centre
- 放射性同位核 【ホウシャセイドウイカク】 radioisotope
Readings
- Korean:
- haeg
Spanish
- semilla
- núcleo
- centro
- meollo
Portuguese
- núcleo
- centro
- cerne
French
- noyau
- nucléaire
- coeur
| 1074 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 577 | A New Dictionary of Kanji Usage |
| 2254 | Classic Nelson (Andrew Nelson) |
| 1608 | Essential Kanji (P.G. O’Neill) |
| 1430 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1212 | Kanji and Kana (Spahn and Hadamitzky) |
| 1275 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 986 | Kanji in Context (Nishiguchi and Kono) |
| 1089 | Kodansha Compact Kanji Guide |
| 1162 | Kodansha Kanji Dictionary (Jack Halpern) |
| 628 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 836 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1534 | Les Kanjis dans la tete (Yves Maniette) |
| 14743 | Morohashi |
| 927 | New Japanese English Character Dictionary (Jack Halpern) |
| 2660 | New Nelson (John Haig) |
| 1520 | Remembering The Kanji (James Heisig) |
| 1638 | Remembering The Kanji, 6th edition (James Heisig) |
| 1348 | Tuttle Kanji Cards (Alexander Kask) |
| 1862 | 2001 Kanji |
| 4a6.22 | The Kanji Dictionary |
| 1-4-6 | SKIP code |
| 4098.2 | Four corner code |
| 1-19-43 | JIS X 0208-1997 kuten code |
| 6838 | Unicode hex code |