This alert comes from Windows 10 build 10074, an early preview version of Microsoft's operating system, where it warned users that a laptop battery had reached a critical level. Like other Windows notification sounds, it was later shared on soundboard sites and reused far beyond its original purpose. Creators now drop it into videos and streams as shorthand for a device, a plan or a person running out of power, because the familiar Windows chime instantly tells viewers that shutdown is imminent.