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  1. en.wikipedia.org › wiki › UTF-8UTF-8 - Wikipedia

    2 天前 · UTF-8 is a variable-length character encoding standard used for electronic communication. Defined by the Unicode Standard, the name is derived from Unicode Transformation Format – 8-bit. [1] UTF-8 is capable of encoding all 1,112,064 [a] valid Unicode code points using one to four one- byte (8-bit) code units.

  2. 3 天前 · This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.

  3. en.wikipedia.org › wiki › ASCIIASCII - Wikipedia

    4 天前 · ASCII codes represent text in computers, telecommunications equipment, and other devices. Because of technical limitations of computer systems at the time it was invented, ASCII has just 128 code points, of which only 95 are printable characters, which severely limited its scope.

  4. en.wikipedia.org › wiki › Paper_sizePaper size - Wikipedia

    2 天前 · Comparison of some paper and photographic paper sizes close to the A4 size. Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents. The ISO 216 standard, which includes the commonly used A4 size, is the international standard for paper size.

  5. 2024年5月22日 · As of Unicode version 15.1, there are 149,878 characters with code points, covering 161 modern and historical scripts, as well as multiple symbol sets. This article includes the 1,062 characters in the Multilingual European Character Set 2 ( MES-2) subset, and some additional related characters.

  6. en.wikipedia.org › wiki › Unit_731Unit 731 - Wikipedia

    2 天前 · Established in 1936, Unit 731 was responsible for some of the most notorious war crimes committed by the Japanese armed forces. It routinely conducted tests on people who were dehumanized and internally referred to as "logs".

  7. en.wikipedia.org › wiki › Vitamin_DVitamin D - Wikipedia

    2024年5月23日 · Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and for many other biological effects. [1] [2] [3] In humans, the most important compounds in this group are vitamin D 3 ( cholecalciferol) and vitamin D 2 ( ergocalciferol ). [2] [3] [4]