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Byte Order MarkA Byte Order Mark (BOM) is the character at code point FEFF (ZERO-WIDTH NO-BREAK SPACE), when that character is used to denote the Endianness of a string of UCS/Unicode characters encoded in UTF-16 or UTF-32. A BOM can also be used to indicate the encoding of unlabeled text in many Unicode encodings. In most encodings the BOM is a sequence which is unlikely to be seen in more conventional encodings or other Unicode encodings (usually looking like a sequence of obscure control codes). If a BOM is misinterpreted as an actual character within the text then it will generally be invisible due to the fact it is a ZERO-WIDTH NO-BREAK SPACE. Some consider such use of the BOM to be misuse though such use is specifically mentioned in official Unicode documents and is never called misuse there. In UTF-16, a BOM is expressed as the 2 byte sequence FE FF at the beginning of the encoded string, to indicate that the encoded characters that follow it use big-endian byte order; or it is expressed as the byte sequence FF FE to indicate little-endian order. UTF-8 text can also use a BOM and quite a lot of windows software adds one to UTF-8 files. However in Unix-like systems (which make heavy use of text files for configuration) this practice is not recommended as it will interfere with correct processing of important codes such as the hash-bang at the start of a file. The UTF-8 representation of the BOM is the byte sequence EF BB BF. Whilst a BOM could be used with UTF-32 this encoding is almost never used for transmission anyway. Representations of Byte Order Marks by Encoding See also External links
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