The kanji 殻 generally represents a "shell," "husk," or "outer covering" of something. It implies a protective layer that surrounds and encloses a softer or more vulnerable interior. This can apply to the shell of a nut, the husk of a grain, or even a broader concept of an outer shell or exterior.

・On-yomi (音読み): カク (kaku) ・Kun-yomi (訓読み): から (kara)

⚫︎貝殻 (kaigara) Translation: Shell (of a shellfish) ⚫︎卵殻 (rankaku) Translation: Eggshell ⚫︎脱穀 (dakkoku) Translation: Threshing (removing grain from its husk)

The kanji 殻 is a pictograph. It originally depicted the structure of a shell or the outer part that encloses something. The character shows the shape of a protective covering. Over time, the character has maintained its association with the concept of an outer layer or shell.