This sound comes from Undertale, the 2015 indie role-playing game created by Toby Fox. Save points in the game became memorable because of their glowing star icon, reflective text and gentle audio cue. Online, the clip spread through fan edits, gameplay compilations and meme videos as a shorthand for reaching safety or making meaningful progress. It still gets used because the sound is tiny, emotionally clear and immediately recognisable to people who know Undertale, while still working as a clean retro game cue for everyone else.