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2. Error detection and correction - Wikipedia

   en.wikipedia.org/wiki/Error_detection_and_correction

   A checksum of a message is a modular arithmetic sum of message code words of a fixed word length (e.g., byte values). The sum may be negated by means of a ones'-complement operation prior to transmission to detect unintentional all-zero messages.

3. On-board diagnostics - Wikipedia

   en.wikipedia.org/wiki/On-board_diagnostics

   It either displays numeric, 4 digit codes identifying the faults or maps them to a letter (P, B, U, C) plus 4 digits. See #OBD-II_diagnostic_trouble_codes. Service / Mode $04 is used to clear emission-related diagnostic information. This includes clearing the stored pending/confirmed DTCs and Freeze Frame data.

4. Barcode reader - Wikipedia

   en.wikipedia.org/wiki/Barcode_reader

   A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner, it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals.

5. Reed–Solomon error correction - Wikipedia

   en.wikipedia.org/wiki/Reed–Solomon_error...

   For example, the widely used (255,223) code can be converted to a (160,128) code by padding the unused portion of the source block with 95 binary zeroes and not transmitting them. At the decoder, the same portion of the block is loaded locally with binary zeroes. The QR code, Ver 3 (29×29) uses interleaved blocks.

6. Commercial and Government Entity code - Wikipedia

   en.wikipedia.org/wiki/Commercial_and_Government...

   The Commercial and Government Entity Code, or CAGE Code, is a unique identifier assigned to suppliers to various government or defense agencies, as well as to government agencies themselves and various organizations. CAGE codes provide a standardized method of identifying a given facility at a specific location.

7. Vaccine passports during the COVID-19 pandemic - Wikipedia

   en.wikipedia.org/wiki/Vaccine_passports_during...

   The QR code can also be physically printed out. [112] New Brunswick requires a Proof of Vaccination system using original immunisation records. [113] Newfoundland and Labrador has plans to release a QR code based system for their vaccine passport. [114] Nova Scotia has a Proof of Full Vaccination Policy using original government issued proof of ...