The kanji character 穴 primarily represents a "hole", "opening", or "cave." It depicts an enclosed space that penetrates or exists within a surface. This can refer to natural formations like caves and burrows, or man-made openings like holes in the ground or in objects.

・On-yomi (音読み): ケツ (ketsu) ・Kun-yomi (訓読み): あな (ana)

⚫︎穴場 Translation: Hidden gem; a secret good place. ⚫︎穴が開く Translation: To have a hole open; to be pierced. ⚫︎防空壕 (ぼうくうごう) Translation: Air-raid shelter (literally: defense-air-hole)

The kanji 穴 is a pictograph. It depicts a simplified representation of a hole or a cave. The top part represents the roof or entrance of the hole, and the bottom part suggests the interior space. Over time, the form has simplified, but the core idea of an opening or enclosed space remains clear.