It looks like the WHO are like English bobbies from 1960s when they carried a truncheon and a very distinctive whistle. “Stop, you miserable thug! I say stop! Stop or I’ll blow my whistle, and if you don’t stop still I shall blow it even harder!!”

https://www.who.int/news-room/fact-sheets/detail/schizophrenia

https://www.who.int/news-room/fact-sheets/detail/schizophrenia