Palu sidang literally means session gavel in Indonesian, the small wooden hammer used by judges and meeting chairs across Indonesia to open proceedings, restore order and confirm decisions. Recordings of the knock circulate on soundboards and in edit packs because the sound is instantly understood even without an image of a courtroom. It became a staple reaction in Indonesian TikTok and WhatsApp edits, where creators use the strike as punctuation for any supposedly final statement, from serious hearing footage to jokes among friends about who wins an argument.