回収
かいしゅう · kaishuu · JLPT N1 · noun
collection
📦 回 (return, around) + 収 (gather in) = gather back in: collection or recovery
回 means turn or return, and 収 means collect or take in. Together they describe gathering something back, as in collecting mail or recovering losses. The same pair appears in 回収車, a garbage collection truck.
回 — enclosure 囗 + smaller 囗 inside
回 is a pictograph of a swirling whirlpool or coiled spiral, shown as nested squares in modern form. The original meaning was 'to revolve' or 'turn around,' which extended to 'return' and 'a time/occurrence.' It also appears as a phonetic in characters like 茴 and 廻.