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2. Rolling code - Wikipedia

   en.wikipedia.org/wiki/Rolling_code

   Rolling code. A rolling code (or sometimes called a hopping code) is used in keyless entry systems to prevent a simple form of replay attack, where an eavesdropper records the transmission and replays it at a later time to cause the receiver to 'unlock'. Such systems are typical in garage door openers and keyless car entry systems.

3. Polar code (coding theory) - Wikipedia

   en.wikipedia.org/wiki/Polar_code_(coding_theory)

   Polar code (coding theory) In information theory, a polar code is a linear block error-correcting code. The code construction is based on a multiple recursive concatenation of a short kernel code which transforms the physical channel into virtual outer channels. When the number of recursions becomes large, the virtual channels tend to either ...

4. Universal Product Code - Wikipedia

   en.wikipedia.org/wiki/Universal_Product_Code

   A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

5. Urban Dictionary - Wikipedia

   en.wikipedia.org/wiki/Urban_Dictionary

   Urban Dictionary Screenshot Screenshot of Urban Dictionary front page (2018) Type of site Dictionary Available in English Owner Aaron Peckham Created by Aaron Peckham URL urbandictionary.com Launched December 9, 1999 ; 24 years ago (1999-12-09) Current status Active Urban Dictionary is a crowdsourced English-language online dictionary for slang words and phrases. The website was founded in ...

6. United States Armed Forces - Wikipedia

   en.wikipedia.org/wiki/United_States_armed_forces

   The armed forces consist of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. [14] [15] All six armed services are among the eight uniformed services of the United States. [16] Each of the different military services is assigned a role and domain. The Army conducts land operations.

7. Coupon - Wikipedia

   en.wikipedia.org/wiki/Coupon

   Coupon. In marketing, a coupon is a ticket or document that can be redeemed for a financial discount or rebate when purchasing a product . Customarily, coupons are issued by manufacturers of consumer packaged goods [1] or by retailers, to be used in retail stores as a part of sales promotions. They are often widely distributed through mail ...