QR code is a Latest Technology for advertisment publicity QR code This article is about the type of barcode. For the mathematical coding theory, see Quadratic residue code. QR code for the URL of the English Wikipedia Mobile main page QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed for the automotive industry in Japan. A barcode is a machine-readable optical label that contains … [Read more...]