Kryakalka is the Russian nickname for the special sound signal fitted to DPS, the road patrol police, cars in Russia. Its quacking tone stands out from standard European and American sirens in dashcam footage posted online. Clips from traffic stops and pursuits helped the sound spread into meme edits, soundboards and short videos far beyond Russia. Because the blast is so short and recognisable, creators now use it as an audio shorthand for police arriving, even in scenes that have nothing to do with real traffic police.