Kryptonian beacons are high-pitched ringing or wailing sounds which are emitted from Kryptonian devices, artifacts, or even symbols. Every Kryptonian house family has a specific beacon with a unique tone, making it distinctive. Chloe Sullivan, through Brainiac, drew the Kryptonian mark for 'Doom', which emitted a Kryptonian beacon that somehow triggered the beast Doomsday through Davis Bloome to him. As Chloe was losing her memories, the only person that she retained any recollection of was Davis.