Kryakalka is the nickname for a distinctive Russian special signal siren, while migalki refers to the flashing beacon lights fitted to police, ambulance and official vehicles in Russia and other post-Soviet countries. Unlike a smooth Western wail, this siren produces a choppy, quacking tone designed to be impossible to ignore in traffic. Short clips of it spread through soundboards, car videos and Russian meme edits, where the one-second blast became shorthand for an urgent arrival, a mock police stop or an official convoy pushing through.