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common

クウ/KŪ/    そら/sora/    あ.く/a.ku/    あ.き/a.ki/    あ.ける/a.keru/    から/kara/    す.く/su.ku/    す.かす/su.kasu/    むな.しい/muna.shii/KUU/クウ/    sora/そら/    a.ku/あ.く/    a.ki/あ.き/    a.keru/あ.ける/    kara/から/    su.ku/す.く/    su.kasu/す.かす/    muna.shii/むな.しい/

empty;  sky;  void;  vacant;  vacuum

Radical: 穴 (cave).   Strokes: 8画.   Elements: 穴工儿宀.   Pinyin: kōng / kòng.   Hangul: 공 [gong].   Nanori: うつ / き / くutsu / ki / ku.

Jōyō Kanji 1st Grade.   JLPT N4.

Example compounds:
クウKŪ空陸【くうりくkūriku】land and air; land and air forces
滑空【かっくうkakkū】gliding in a glider
高空【こうくうkōkū】high altitude
そらsora絵空事【えそらごとesoragoto】fabrication; pipe dream
空模様【そらもようsoramoyō】look of the sky; weather
空【そらsora】sky; the heavens
あくaku空く【あくaku】to open (e.g. doors); to open (e.g. business, etc.); to be empty; to be vacant; to be open (e.g. neckline, etc.); to have been opened (of one's eyes, mouth, etc.); to come to an end; to open (one's eyes, mouth, etc.); to have a hole
穴が空く【あながあくanagāku】to have a hole; to be pierced (with a hole)
時間が空く【じかんがあくjikangāku】to have time free; to have time to spare
あきaki空き巣【あきすakisu】prowler; empty nest
空き室【あきしつakishitsu】vacant or unoccupied room
空き瓶【あきびんakibin】empty bottle
あけるakeru空ける【あけるakeru】to open (a door, etc.); to open (for business, etc.); to empty; to dawn; to end
間を空ける【まをあけるmawoakeru】to leave space (between)
一字空ける【いちじあけるichijiakeru】to leave a space (between words)
からkara空回り【からまわりkaramawari】racing (of an engine); spinning one's wheels; fruitless effort
空揚げ【からあげkarāge】fried (e.g. potatoes, chicken)
空っぽ【からっぽkarappo】empty; vacant; hollow
すくsuku空く【すくsuku】to become less crowded; to be hungry
お腹が空く【おなかがすくonakagasuku】to become hungry; to get an empty stomach
腹が空く【はらがすくharagasuku】to become hungry; to get an empty stomach
すかすsukasu手を空かす【てをすかすtewosukasu】to make oneself available
腹を空かす【はらをすかすharawosukasu】to be hungry
空かす【すかすsukasu】to feel hungry; to get hungry
むなしいmunashii空しい【むなしいmunashii】vacant; futile; vain; void; empty; ineffective; lifeless
空しい名声【むなしいめいせいmunashiimeisei】empty name
Codepoints and classification codes:
7a7a–Unicode
22-85–JIS X 0208
2-3-5–SKIP
3m5.12–TKD
3010.1–Four Corner
772–De Roo
Dictionary indices:
3317–Classic Nelson
4192–The New Nelson Character Dictionary by A. Nelson
2227–New Japanese-English Character Dictionary by J. Halpern
1418–Kanji Learner's Dictionary by J. Halpern
1317–Remembering the Kanji by J. Heisig
233–A New Dictionary of Kanji Usage (Gakken)
723–Japanese Names by P.G. O'Neill
184–Essential Kanji by P.G. O'Neill
25415–Daikanwajiten 「大漢和辞典」 by T. Morohashi vol. 8 p. 643
15–A Guide to Remembering Japanese Characters by K.G. Henshall
140–Kanji & Kana by Spahn and Hadamitzky
65–Guide to Reading & Writing Japanese (H) by F. Sakade
77–Kanji Flashcards by M. Hodges and T. Okazaki
66–Guide to Reading & Writing Japanese: Third Edition 3rd edition by Henshall
73–Tuttle Kanji Cards by A. Kask
304–The Kanji Way to Japanese Language Power by D. Crowley
461–Kanji in Context by Nishiguchi and Kono
2.17–Japanese for Busy People by the AJLT
1452–Kodansha Compact Kanji Guide
1327–Y. Maniette's French adaptation of Heisig
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