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Base32 is an encoding method based on the base-32 numeral system.It uses an alphabet of 32 digits, each of which represents a different combination of 5 bits (2 5).Since base32 is not very widely adopted, the question of notation—which characters to use to represent the 32 digits—is not as settled as in the case of more well-known numeral systems (such as hexadecimal), though RFCs and ...
v. t. e. In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system 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 ...
ISO/IEC 10646 ( Unicode) v. t. e. UTF-16 ( 16-bit Unicode Transformation Format) is a character encoding capable of encoding all 1,112,064 valid code points of Unicode (in fact this number of code points is dictated by the design of UTF-16). The encoding is variable-length, as code points are encoded with one or two 16-bit code units.
UCS-2 is an obsolete subset of UTF-16; UCS-4 and UTF-32 are functionally equivalent. UTF encodings include: UTF-8, which uses one to four bytes per code point, and has maximal compatibility with ASCII; UTF-16, which uses either one or two 16-bit units per code point, but cannot encode surrogates; UTF-32, which uses one 32-bit unit per code point
A code unit is the minimum bit combination that can represent a character in a character encoding (in computer science terms, it is the word size of the character encoding). [10] [12] For example, common code units include 7-bit, 8-bit, 16-bit, and 32-bit.
e. BCD ( binary-coded decimal ), also called alphanumeric BCD, alphameric BCD, BCD Interchange Code, [ 1] or BCDIC, [ 1] is a family of representations of numerals, uppercase Latin letters, and some special and control characters as six-bit character codes . Unlike later encodings such as ASCII, BCD codes were not standardized.
The limit of 17 planes is due to UTF-16, which can encode 2 20 code points (16 planes) as pairs of words, plus the BMP as a single word. [2] UTF-8 was designed with a much larger limit of 2 31 (2,147,483,648) code points (32,768 planes), and would still be able to encode 2 21 (2,097,152) code points (32 planes) even under the current limit of 4 ...
The UTF-5 proposal used a base 32 encoding, where Punycode is (among other things, and not exactly) a base 36 encoding. The name UTF-5 for a code unit of 5 bits is explained by the equation 2 5 = 32. [4] The UTF-6 proposal added a running length encoding to UTF-5, here 6 simply stands for UTF-5 plus 1. [5]