18 strokes
                                                    
                        Jouyou kanji
            Taught in 4th grade
    
                                                    JLPT exam level N4
                                            verification, effect, testing
Kun'yomi
- あかし 
- し - る - し - sign 
- た - め - す - to try (out) 
- た - め - し - trial 
On'yomi
- ケン - effect ②omen 
- ゲ - ン - effect ②omen 
Character Breakdown
verification, effect, testing
ケン ため.す あかし (4th, N4)
horse
ま バ うま (2nd, N3)
References
| Unicode hex code | 9A13 | 
| JIS X 0208 | 1-24-19 | 
| Nelson, A. Classic Nelson | 5220 | 
| Haig, J. New Nelson Japanese-English Character Dictionary | 6758 | 
| Halpern, J. New Japanese-English Character Dictionary | 1833 | 
| Halpern, J. Kodansha Kanji Dictionary | 2306 | 
| Halpern, J. Kanji Learners Dictionary (Kodansha) | 1192 | 
| Halpern, J. Kanji Learners Dictionary (Kodansha), 2nd edition (2013) | 1628 | 
| Heisig, J. Remembering The Kanji | 1980 | 
| Heisig, J. Remembering The Kanji, Sixth Ed. | 2134 | 
| Gakken A New Dictionary of Kanji Usage | 404 | 
| O'Neill, P.G. Essential Kanji | 355 | 
| Morohashi Daikanwajiten | 44835 | 
| Henshall, K. A Guide To Remembering Japanese Characters | 475 | 
| Spahn and Hadamitzky Kanji and Kana | 532 | 
| Spahn and Hadamitzky Kanji and Kana (2011 edition) | 541 | 
| Sakade, F. A Guide To Reading and Writing Japanese | 600 | 
| Hodges & Okazaki Japanese Kanji Flashcards | 282 | 
| Henshall & De Groot A Guide To Reading and Writing Japanese, 3rd ed. | 500 | 
| Kask, A. Tuttle Kanji Cards | 635 | 
| Crowley, D. The Kanji Way to Japanese Language Power | 385 | 
| Nishiguchi & Kono Kanji in Context | 793 | 
| AJLT Japanese For Busy People vols I-III | 2.9 | 
| Kodansha Kodansha Compact Kanji Guide | 1920 | 
| Maniette, Y. Les Kanjis dans la tete | 1999 | 
| Tuttle Dictionary Descriptor Code | 10a8.4 | 
| Four corner code | 7833.6 | 
| De Roo Code | 3463 |