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The byte-order mark (BOM) is a particular usage of the special Unicode character code, U+FEFF ZERO WIDTH NO-BREAK SPACE, whose appearance as a magic number at the start of a text stream can signal several things to a program reading the text: [1] the byte order, or endianness, of the text stream in the cases of 16-bit and 32-bit encodings;
A byte order mark (BOM) is an optional special byte sequence at the very start of a stream or file that, without being data itself, indicates the encoding used for the data that follows; it can be used in the absence of metadata that denotes the encoding. For a given encoding scheme, it's that scheme's representation of Unicode code point U ...
When appearing at the head of a text file or stream, the byte order mark (BOM) U+FEFF hints at the encoding form and its byte order. If the stream's first byte is 0xFE and the second 0xFF, then the stream's text is not likely to be encoded in UTF-8, since those bytes are invalid in UTF-8.
In some locales UTF-8N means UTF-8 without a byte-order mark (BOM), and in this case UTF-8 may imply there is a BOM. [76] [77] In Windows, UTF-8 is codepage 65001 [78] with the symbolic name CP_UTF8 in source code. In MySQL, UTF-8 is called utf8mb4, [79] while utf8 and utf8mb3 refer to the obsolete CESU-8 variant. [80]
To assist in recognizing the byte order of code units, UTF-16 allows a byte order mark (BOM), a code point with the value U+FEFF, to precede the first actual coded value. [c] (U+FEFF is the invisible zero-width non-breaking space/ZWNBSP character).
The UCS-2 and UTF-16 encodings specify the Unicode byte order mark (BOM) for use at the beginnings of text files, which may be used for byte-order detection (or byte endianness detection). The BOM, encoded as U+FEFF ZERO WIDTH NO-BREAK SPACE, has the important property of unambiguity on byte reorder, regardless of the Unicode encoding used; U ...
An executive order is a signed directive by a U.S. president on how they want the federal government to operate. Using the force of the law, these orders range from federal employee holidays to ...
UTF-16BE byte order mark, commonly seen in text files. [28] [29] [30] FF FE 00 00: ÿþ␀␀ 0 txt others: UTF-32LE byte order mark for text [28] [30] 00 00 FE FF ␀␀þÿ: 0 txt others: UTF-32BE byte order mark for text [28] [30] 2B 2F 76 38 2B 2F 76 39 2B 2F 76 2B 2B 2F 76 2F +/v8 +/v9 +/v+ +/v/ 0 UTF-7 byte order mark for text [31] [30 ...