Online, this less-than-a-second hum has circulated as a meme reaction sound, shared in anime edits and short-form videos where a quick vocal pause says more than dialogue. Its file metadata tags it to Hatsune Miku, the Vocaloid singer, which helps explain its clean, stylised delivery, though the clip itself is used far more as a generic thinking sound than as a musical excerpt. It sits alongside other short anime reaction sounds and is often dropped into an awkward moment to signal doubt, curiosity, or a sudden realisation before the scene moves on.