The scanner beep comes from retail barcode technology, which entered supermarkets in the 1970s after the first commercial barcode scan in 1974. Handheld and fixed checkout scanners still use a short audible tone to confirm a code has been read successfully, so staff and customers know the item registered without looking at the screen. That everyday confirmation tone later moved into video editing and meme soundboards as a reusable effect. Creators borrow it whenever a scene needs instant scanning, checking or approval, because the meaning is understood worldwide without any words or explanation needed.