石

It is a pictograph representing a stone falling from a cliff. An ancient form of 石 is 𥐘. The 广+廿 form seen in characters like 席, 度, and 庶 is also a variant derived from 石.

The radical form of 石 (stone) can appear as a side radical (변) or a bottom radical (발).

As a radical meaning "stone," it frequently appears in characters related to stones, actions involving stones, or qualities like hardness.

Examples include:

砲 (포, cannon/gunpowder)

岩 (암, rock)

硅 (규, silicon)

破 (파, to break)

碑 (비, monument stone)

磨 (마, to grind)

硏 (연, to sharpen)

硝 (초, nitrate)

硫 (류, sulfur)

磁 (자, magnet)

碧 (벽, blue/green jade)

礎 (초, foundation stone)

硬 (경, hard)

確 (확, certain)

碎 (쇄, to crush)

and many more

These characters are all associated with stone or stone-like qualities