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Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.
Centered hexagonal numbers appearing in the Catan board game: 19 land tiles, 37 total tiles. In mathematics and combinatorics, a centered hexagonal number, or hex number, [1] [2] is a centered figurate number that represents a hexagon with a dot in the center and all other dots surrounding the center dot in a hexagonal lattice.
Hexspeak is a novelty form of variant English spelling using the hexadecimal digits. Created by programmers as memorable magic numbers, hexspeak words can serve as a clear and unique identifier with which to mark memory or data. Hexadecimal notation represents numbers using the 16 digits 0123456789ABCDEF.
The hhhh for hexadecimal digits may mix uppercase and lowercase letters, though uppercase is the usual style. However the XML and HTML standards restrict the usable code points to a set of valid values, which is a subset of UCS/Unicode code point values, that excludes all code points assigned to non-characters or to surrogates, and most code ...
However, because it is harder to pronounce, the short form hextet is used—in analogy to how hex is commonly used as an abbreviation for hexadecimal in computing. This usage of hex to mean 16 is also in line with the similar IEEE 1754 term hexlet indicating 16 octets. [5]
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Hex signature ISO 8859-1 Offset Extension Description 23 21 #! 0 Script or data to be passed to the program following the shebang (#!) [1] 02 00 5a 57 52 54 00 00 00 00 00 00 00 00 00 00 ␂␀ZWRT␀␀␀␀␀␀␀␀␀␀ 0 cwk Claris Works word processing doc 00 00 02 00 06 04 06 00 08 00 00 00 00 00 ...
where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form. The x must be lowercase in XML documents. The nnnn or hhhh may be any number of digits and may include leading zeros. The hhhh may mix uppercase and lowercase, though uppercase is the usual style.