| 453 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 352 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 534 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 659 | A New Dictionary of Kanji Usage |
| 4700 | Classic Nelson (Andrew Nelson) |
| 848 | Essential Kanji (P.G. O’Neill) |
| 958 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 1237 | Japanese Names (P.G. O’Neill) |
| 502 | Kanji and Kana (Spahn and Hadamitzky) |
| 511 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 383 | Kanji in Context (Nishiguchi and Kono) |
| 693 | Kodansha Compact Kanji Guide |
| 3851 | Kodansha Kanji Dictionary (Jack Halpern) |
| 1978 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 2674 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1685 | Les Kanjis dans la tete (Yves Maniette) |
| 38897P | Morohashi |
| 3105 | New Japanese English Character Dictionary (Jack Halpern) |
| 6060 | New Nelson (John Haig) |
| 1669 | Remembering The Kanji (James Heisig) |
| 1799 | Remembering The Kanji, 6th edition (James Heisig) |
| 360 | Tuttle Kanji Cards (Alexander Kask) |
Jōyō kanji, taught in grade 3
JLPT level N3
576 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 速 【ソク】 gear, speed (e.g. 4-speed transmission)
- 速度 【ソクド】 speed, velocity, pace, rate, velocity
- 失速 【シッソク】 stall, downturn, slowdown, slump, weakening, decline
- 快速 【カイソク】 high speed, rapidity, rapid-service train (not as fast as express), rapid train
Kun reading compounds
- 早い 【はやい】 fast, quick, rapid, swift, speedy, brisk, prompt, early, soon, earlier than usual, premature, too soon, too early, easy, simple, quick, fast, as soon as ..., the moment ..., the instant ...
- 早める 【はやめる】 to bring forward (e.g. by 3 hours), to advance, to hasten (e.g. one's death), to expedite, to precipitate, to quicken (e.g. one's step), to speed up, to accelerate
- 速やか 【すみやか】 quick, speedy, prompt, rapid, swift
Readings
- Japanese names:
- わ
- Korean:
- sog
Spanish
- rápido
- veloz
- darse prisa
- velocidad
Portuguese
- rápido
- apressar
French
- vite
- rapide
| 1564 | 2001 Kanji |
| 2q7.4 | The Kanji Dictionary |
| 3-3-7 | SKIP code |
| 3530.9 | Four corner code |
| 1-34-14 | JIS X 0208-1997 kuten code |
| 901f | Unicode hex code |
Jōyō kanji, taught in grade 5
JLPT level N2
538 of 2500 most used kanji in newspapers
Stroke order
On reading compounds
- 効 【コウ】 efficacy, benefit, efficiency, effect, result, success
- 効果 【コウカ】 effect, effectiveness, efficacy, result, effects (e.g. sound effects, visual effects, special effects)
- 実効 【ジッコウ】 practical effect, efficacy, efficiency
- 時効 【ジコウ】 statute of limitations, lapse of rights after a period of time, prescription (including acquisitive and extinctive prescription), becoming invalid or void after a set time, ageing, aging
Kun reading compounds
- 効く 【きく】 to be effective, to take effect, to be good (for), to work, to function well, to be possible (to do, use, etc.), to be able to, to taste (alcohol), to try
- 効き目 【ききめ】 effect, virtue, efficacy, impression, one's dominant eye
Readings
- Korean:
- hyo
Spanish
- eficacia
- eficiencia
- efecto
- ser efectivo
Portuguese
- mérito
- eficácia
- eficiência
- benefício
French
- efficacité
- bénéfique
- mérite
| 782 | A Guide To Reading and Writing Japanese (Florence Sakade) |
| 697 | A Guide To Reading and Writing Japanese 3rd edition (Henshall, Seeley and De Groot) |
| 671 | A Guide To Remembering Japanese Characters (Kenneth G. Henshall) |
| 515 | A New Dictionary of Kanji Usage |
| 722 | Classic Nelson (Andrew Nelson) |
| 623 | Essential Kanji (P.G. O’Neill) |
| 370 | Japanese Kanji Flashcards (Max Hodges and Tomoko Okazaki) |
| 653 | Japanese Names (P.G. O’Neill) |
| 816 | Kanji and Kana (Spahn and Hadamitzky) |
| 835 | Kanji and Kana, 2nd Edition (Spahn and Hadamitzky) |
| 501 | Kanji in Context (Nishiguchi and Kono) |
| 216 | Kodansha Compact Kanji Guide |
| 1617 | Kodansha Kanji Dictionary (Jack Halpern) |
| 849 | Kodansha Kanji Learner’s Dictionary (Jack Halpern) |
| 1164 | Kodansha Kanji Learner’s Dictionary, 2nd Edition (Jack Halpern) |
| 1284 | Les Kanjis dans la tete (Yves Maniette) |
| 2334 | Morohashi |
| 1265 | New Japanese English Character Dictionary (Jack Halpern) |
| 535 | New Nelson (John Haig) |
| 1276 | Remembering The Kanji (James Heisig) |
| 1369 | Remembering The Kanji, 6th edition (James Heisig) |
| 682 | Tuttle Kanji Cards (Alexander Kask) |
| 445 | 2001 Kanji |
| 2g6.2 | The Kanji Dictionary |
| 1-6-2 | SKIP code |
| 0442.7 | Four corner code |
| 1-24-90 | JIS X 0208-1997 kuten code |
| 52b9 | Unicode hex code |