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  2. IDN homograph attack - Wikipedia

    en.wikipedia.org/wiki/IDN_homograph_attack

    An example of an IDN homograph attack; the Latin letters "e" and "a" are replaced with the Cyrillic letters "е" and "а".The internationalized domain name (IDN) homoglyph attack (often written as homograph attack) is a method used by malicious parties to deceive computer users about what remote system they are communicating with, by exploiting the fact that many different characters look ...

  3. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    400-toll-free numbers with prefix "4001" are international toll-free numbers which can be routed to destination numbers inside or outside China. 400 toll-free numbers with prefix "4000", "4006", "4007" or "4008" are national toll-free numbers which can be routed to China destination numbers only.

  4. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    In combinatorics, 20 is the number of distinct combinations of 6 items taken 3 at a time. Equivalently, it is the central binomial coefficient for n=3 (sequence A000984 in the OEIS). In decimal, 20 is the smallest non-trivial neon number equal to the sum of its digits when raised to the thirteenth power (20 13 = 8192 × 10 13). [citation needed]

  5. Area code 773 - Wikipedia

    en.wikipedia.org/wiki/Area_code_773

    In 1989, area code 708 was created for the suburbs, leaving the city in area code 312. By the mid-1990s, Chicago's continued growth and the proliferation of cell phones and pagers made it apparent that the city needed a new area code. It was decided to split off all of the city outside the downtown area as 773.

  6. Area codes 416, 647, and 437 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_416,_647,_and_437

    A new overlay area code, 437, started operation on March 25, 2013. [6] [7] That effectively allocates 24 million numbers to a city of 2.5 million people. Area code 942 is scheduled for addition to the 416/647/437 overlay on April 26, 2025. [8] Area code 387 has been reserved for Toronto's future use.

  7. 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 ...

  8. Ethanol - Wikipedia

    en.wikipedia.org/wiki/Ethanol

    Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound with the chemical formula CH 3 CH 2 OH.It is an alcohol, with its formula also written as C 2 H 5 OH, C 2 H 6 O or EtOH, where Et stands for ethyl.

  9. Telephone numbers in Kosovo - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Kosovo

    Following the breakup of the SFR Yugoslavia in 1992, which had +38 as country code, Kosovo used the code +381, which was granted to FR Yugoslavia and later used by Serbia. The code was used for fixed line telephone services, whereas for mobile phone networks, it used either the Monaco code +377 or the Slovenian code +386 . [ 6 ]