回

Counter for repetitions, rounds, or episodes.

Symbol of “double insulation” in electrical devices.

Pictograph, later regularized as a compound:

Originally depicted water currents circling around one spot (a whirlpool).

Later stylized as 囗 (enclosure) + 口 (mouth, square) inside.

Semantic: circular enclosure, turning back.

Thus the meaning “to return, to go around.”

回數 (회수) — number of times, frequency

回復 (회복) — recovery, restoration

回轉 (회전) — rotation, revolution

回答 (회답) — reply, answer

回顧 (회고) — recollection, retrospection

一回 (일회) — one time, once

In media/serialization: used as “episode” or “installment” (e.g., 만화 1회, 드라마 5회).

Historically also associated with Islam and Hui people (회교, 회회인, 회회어).

囬 (U+56EC), 囘 (U+56D8)