Not Just For Commerce
QR Codes - a brief history. QR code (abbreviated from Quick Response Code) is a the trademark for a type of matrix barcode first designed for the automotive industry in Japan. QR Codes became popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes.
What Can I Do w/ QR Codes?
Really the skies the limit. Here are a few examples.
Algebra Inverser Operations