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2. Digital coupon - Wikipedia

   en.wikipedia.org/wiki/Digital_coupon

   Digital coupons (also known as e-coupons, e-clips or clipped deals) are the digital analogue of paper coupons which are used to provide customers with discounts or gifts in order to attract the purchase of some products. Mostly, grocery and drug stores offer e-coupon services in loyalty program events. Even though there are still traditional ...

3. ISO 3166-1 alpha-2 - Wikipedia

   en.wikipedia.org/wiki/ISO_3166-1_alpha-2

   ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard [1] published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. They are the most widely used of the country codes published by ISO (the ...

4. Morse code - Wikipedia

   en.wikipedia.org/wiki/Morse_code

   Morse code is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs. [3] [4] Morse code is named after Samuel Morse, one of the early developers of the system adopted for electrical telegraphy . International Morse code encodes the 26 ...

5. International reply coupon - Wikipedia

   en.wikipedia.org/wiki/International_reply_coupon

   International reply coupon. An international reply coupon (IRC) is a coupon that can be exchanged for one or more postage stamps representing the minimum postage for an unregistered priority airmail letter of up to twenty grams sent to another Universal Postal Union (UPU) member country. IRCs are accepted by all UPU member countries.

6. Code of Hammurabi - Wikipedia

   en.wikipedia.org/wiki/Code_of_Hammurabi

   Full text. Code of Hammurabi at Wikisource. The Code of Hammurabi is a Babylonian legal text composed during 1755–1750 BC. It is the longest, best-organized, and best-preserved legal text from the ancient Near East. It is written in the Old Babylonian dialect of Akkadian, purportedly by Hammurabi, sixth king of the First Dynasty of Babylon.

7. 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 ...