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In 8-bit codes, it is known as a null byte. ... The Hexadecimal notation for null is 00. Decoding the Base64 string AA== also yields the null character.
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 ...
The NULL character (code 0) is represented by Ctrl-@, "@" being the code immediately before "A" in the ASCII character set. For convenience, some terminals accept Ctrl-Space as an alias for Ctrl-@. In either case, this produces one of the 32 ASCII control codes between 0 and 31.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
Null-terminated strings require that the encoding does not use a zero byte (0x00) anywhere; therefore it is not possible to store every possible ASCII or UTF-8 string. [ 8 ] [ 9 ] [ 10 ] However, it is common to store the subset of ASCII or UTF-8 – every character except NUL – in null-terminated strings.
\0 null character (U+0000 <control-0000>) (only if the next character is not a decimal digit; else it is an octal escape sequence) \xFF character represented by the hexadecimal byte FF; The \v and \0 escapes are not allowed in JSON strings. Example code:
These codes represent letters, digits, punctuation marks, and a few miscellaneous symbols. There are 95 printable characters in total. [n] The empty space between words, as produced by the space bar of a keyboard, is character code 20 hex. Since the space character is visible in printed text it considered a "printable character", even though it ...
The null sign (∅) is often used in mathematics for denoting the empty set. The same letter in linguistics represents zero , the lack of an element. It is commonly used in phonology , morphology , and syntax .