common

オウ/Ō/    くぼ.む/kubo.mu/    へこ.む/heko.mu/    ぼこ/boko/OU/オウ/    kubo.mu/くぼ.む/    heko.mu/へこ.む/    boko/ぼこ/

concave;  hollow;  sunken

Radical: (open box).   Strokes: 5画.   Elements: .   Pinyin: āo / .   Hangul:  [yo].

Jōyō Kanji High School.   JLPT N1.

Example compounds:
オウŌおうとつōtotsu】unevenness; roughness; ruggedness
おうō】concave; hollow; sunken
おうがんōgan】cavernous eyes
くぼkubomuくぼむkubomu】to cave in; to become depressed; to sink
へこhekomuへこむhekomu】to be dented; to be overwhelmed
ぼこbokoでこぼこdekoboko】unevenness; roughness; ruggedness
あなぼこanaboko】hole; hollow
Codepoints and classification codes:
51f9Unicode
17-90JIS X 0208
4-5-1SKIP
0a5.14TKD
7777.0Four Corner
3675De Roo
Dictionary indices:
664Classic Nelson
444The New Nelson Character Dictionary by A. Nelson
3482New Japanese-English Character Dictionary by J. Halpern
2170Kanji Learner's Dictionary by J. Halpern
33Remembering the Kanji by J. Heisig
1920A New Dictionary of Kanji Usage (Gakken)
1883Essential Kanji by P.G. O'Neill
1810Daikanwajiten 「大漢和辞典」 by T. Morohashi vol. 2 p. 175
1032A Guide to Remembering Japanese Characters by K.G. Henshall
1893Kanji & Kana by Spahn and Hadamitzky
1087Kanji Flashcards by M. Hodges and T. Okazaki
1039Tuttle Kanji Cards by A. Kask
1922Kanji in Context by Nishiguchi and Kono
173Kodansha Compact Kanji Guide
33Y. Maniette's French adaptation of Heisig