Rayo is the Spanish word for lightning bolt, which explains the search phrase sonido rayo used by Spanish-speaking creators looking for a thunder sound. Short lightning effects like this circulated widely through free sound libraries, video editors and meme soundboards, where a five-second strike became a reusable shorthand for storms and sudden power. Its length, with both a sharp attack and a fading rumble, made it more versatile than a single zap, so it stuck in edits for weather scenes, pranks, anime power-ups and dramatic announcements across social video platforms.