～済
～ずみ · ～zumi · JLPT N2 · noun
finished
🏁 ～済 zumi sounds like sum: the sum is done, so it's finished
From 済む sumu, to be settled or to end. Stuck onto a noun, it marks the job as done: 確認済 kakuninzumi means already checked, and 支払済 shiharaizumi means already paid. The kanji is 氵 water + 斉, and its old meaning is getting across a river.