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2. Morse code - Wikipedia

   en.wikipedia.org/wiki/Morse_code

   Chart of the Morse code 26 letters and 10 numerals [1]. This Morse key was originally used by Gotthard railway, later by a shortwave radio amateur [2]. Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

3. 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 ...

4. G-code - Wikipedia

   en.wikipedia.org/wiki/G-code

   G-code (also RS-274) is the most widely used computer numerical control (CNC) and 3D printing programming language. It is used mainly in computer-aided manufacturing ...

5. Ten-code - Wikipedia

   en.wikipedia.org/wiki/Ten-code

   California Penal Code sections were in use by the Los Angeles Police Department as early as the 1940s, and these Hundred Code numbers are still used today instead of the corresponding ten-code. Generally these are given as two sets of numbers [ citation needed ] —"One Eighty-Seven" or "Fifty-One Fifty"—with a few exceptions such as "459 ...

6. Standard deviation - Wikipedia

   en.wikipedia.org/wiki/Standard_deviation

   Stock A over the past 20 years had an average return of 10 percent, with a standard deviation of 20 percentage points (pp) and Stock B, over the same period, had average returns of 12 percent but a higher standard deviation of 30 pp. On the basis of risk and return, an investor may decide that Stock A is the safer choice, because Stock B's ...

7. Black Friday (shopping) - Wikipedia

   en.wikipedia.org/wiki/Black_Friday_(shopping)

   On November 20, 2020, the French government finalized an agreement with e-commerce businesses like Amazon and supermarket chains to postpone Black Friday promotions by a week. Discounted shopping promotions were to begin on December 4 instead, after physical stores shuttered during the COVID-19 pandemic were allowed to reopen. [46]