• 関係かんけい — relationship / connection
• 関心かんしん — interest / concern
• 関所せきしょ — checkpoint / barrier
• 機関きかん — institution / engine / mechanism
• 関税かんぜい — tariff
• 関かかわる — to be involved with / to affect

関 includes the radical 門 (gate) and the component 𢇇, originally representing a hand action. The character conveys the idea of "guarding a gate" or "being involved with what passes through." In modern use, it also suggests mental or emotional involvement.

この件けんに関かんしては 後あとで話はなします。
We’ll talk about this matter later.

関所せきしょで 通行つうこうが 止とめられた。
We were stopped at the checkpoint.

その事故じこに関かんわった人ひとを 探さがしています。
We’re looking for people involved in the accident.

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