재활 – recycle

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재활 means recycle. In the sign above, it says 재활용 – the 용 word means “to be used for”. Obviously, as indicated by the slot and recycling graphic, this box is where you can put your old clothes. (의류수거함 means clothing bin, with 의류 meaning clothing.)
재활 stores in Korea are the equivalent of second-hand or thrift shops.