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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

3. List of Internet top-level domains - Wikipedia

   en.wikipedia.org/wiki/List_of_Internet_top-level...

   As of 20 May 2017, there were 255 country-code top-level domains, purely in the Latin alphabet, using two-character codes. As of June 2022 [update] , the number was 316, with the addition of internationalized domains.

4. United States license plate designs and serial formats

   en.wikipedia.org/wiki/United_States_license...

   Indiana and Ohio display two-number county codes, while Kansas plates display two-letter county codes, but these codes are placed on a sticker or are printed in the corner of the plate in a smaller font size. Texas places the county name only on the windshield registration sticker, where the car's license plate number is also printed.

5. Mobile payment - Wikipedia

   en.wikipedia.org/wiki/Mobile_payment

   QR, or "quick response", bar codes were designed to contain the meaningful information directly in the bar code. QR codes can be of two main categories: [citation needed] The QR code is presented on the mobile device of the person paying and scanned by a POS or another mobile device of the payee

6. List of ISO 3166 country codes - Wikipedia

   en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

   ISO 3166-1 alpha-2 – two-letter country codes which are also used to create the ISO 3166-2 country subdivision codes and the Internet country code top-level domains. ISO 3166-1 alpha-3 – three-letter country codes which may allow a better visual association between the codes and the country names than the 3166-1 alpha-2 codes.

7. ISO 3166-1 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1

   ISO 3166-1 ( Codes for the representation of names of countries and their subdivisions – Part 1: Country codes) is a standard defining codes for the names of countries, dependent territories, and special areas of geographical interest. It is the first part of the ISO 3166 standard published by the International Organization for Standardization .