QR code design uses three corner squares for orientation

QR codes utilize a specific design feature known as the ‘Finder Pattern,’ which consists of three large squares located at the top-left, top-right, and bottom-left corners. This three-square configuration is intentional, allowing scanning devices to identify the orientation of the code.

Because the scanner can recognize which corner lacks a large square (the bottom-right), users can scan codes from various angles without needing to rotate their devices to a specific upright position. This technology was originally developed in 1994 by Masahiro Hara and a team at Denso Wave.