The kanji 空 primarily represents the concept of "empty," "sky," or "void." It signifies a lack of something, an absence, or an open space. It can refer to the space above, as in the sky, or to an internal state of emptiness or void.

・On-yomi (音読み): クウ (kuu) ・Kun-yomi (訓読み): そら (sora), あ（く） (a(ku)), から (kara)

⚫︎ 空 (そら) が青い。 Translation: The sky is blue. ⚫︎ 部屋は空 (から) だ。 Translation: The room is empty. ⚫︎ 空想 (くうそう) する。 Translation: To daydream; to fantasize.

The kanji 空 is a pictograph. It depicts an empty space or a hole. The top part represents the sky, and the bottom part represents a hole or emptiness. The character evolved to represent the concept of "empty," "sky," and "void" over time.