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The "Tudum" sound is officially called an "ident" and was nearly a goat’s bleat before they settled on the two-beat ring.

According to Netflix, these light beams are actually a "barcode visualization" . They were created by turning the thumbnails of Netflix original shows sideways, representing the vast depth and variety of content available on the platform. netflix_logo_intro_2021

Netflix spent developing this specific animation. By focusing on the "N" symbol rather than the full wordmark, Netflix cemented the letter as a universally identifiable shorthand for the brand. The "Tudum" sound is officially called an "ident"