It's super late at night (or actually early morning now) so maybe I am going a bit crazy, but I thought this looked like a "Wash Your Hands" sign. I suppose it's a remix of a "no littering" sign though, so I hope it doesn't look like a "littering is ok" sign? Those are SOAP bubbles, wash your hands after you use the bathroom, ok? Clean clean!<br/>洗你的手<br/>bubbles、Circle Icons、clean、hands、hygiene、poster、sign、sink、soap、wash、water<br/>泡泡、圓圈圖標、清潔、手、衛生、海報、標誌、下沉、肥皂、洗、水<br/>資料來源：openclipart ( https://openclipart.org/ )