Nokia used different system sounds across its Belle, Asha and X phone families in the early smartphone era, and this normal low battery alert was the standard warning heard before the device shut down. As those handsets disappeared, recordings of their ringtones and alerts were saved by users and shared on soundboards and video edits. The beep survived because it is short, clear and widely understood, so creators still use it as a universal symbol for a phone, game controller or person running out of power.