空 (pinyin kōng, "empty") is an HSK 3 Mandarin character with 8 strokes, built on the radical 穴.
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空
Newkōng
empty, sky
Tone 1 · First tone (high level)
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Radical family
Other characters built on the same radical 穴. Often shares meaning category.
Pinyin neighbors
Characters with the same rime -ong, same-tone matches first. Many are true phonetic relatives; others are coincidental.