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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   They can generate and print their own QR codes for others to scan and use by visiting one of several pay or free QR code-generating sites or apps. Google had an API, now deprecated, to generate QR codes, [24] and apps for scanning QR codes can be found on nearly all smartphone devices. [25]

3. QRpedia - Wikipedia

   en.wikipedia.org/wiki/QRpedia

   QRpedia is a mobile Web -based system which uses QR codes to deliver Wikipedia articles to users, in their preferred language. [1] [2] [3] A typical use is on museum labels, linking to Wikipedia articles about the exhibited object. QR codes can easily be generated to link directly to any Uniform Resource Identifier (URI), but the QRpedia system ...

4. QR code payment - Wikipedia

   en.wikipedia.org/wiki/QR_code_payment

   A QR code payment is a mobile payment method where payment is performed by scanning a QR code from a mobile app. [1] This is an alternative to doing electronic funds transfer at point of sale using a payment terminal. [2] This avoids a lot of the infrastructure traditionally associated with electronic payments such as payment cards, payment ...

5. QR decomposition - Wikipedia

   en.wikipedia.org/wiki/QR_decomposition

   QR decomposition. In linear algebra, a QR decomposition, also known as a QR factorization or QU factorization, is a decomposition of a matrix A into a product A = QR of an orthonormal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares (LLS) problem and is the basis for a particular ...

6. What you need to know about QR code scams and how to ... - AOL

   www.aol.com/know-qr-code-scams-stay-204500807.html

   QR codes skyrocketed in popularity during the touch-free days of the COVID-19 pandemic, and now they're everywhere. ... If an email from an unknown sender asks you to scan a QR code, open links ...

7. Barcode - Wikipedia

   en.wikipedia.org/wiki/Barcode

   A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called barcode ...