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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 ...
Presentation: A corrected name is preceded by symbol ※ (the reference mark). 4. Alternate For widely used alternate name for a character. There is 1 such alias. Example: U+FEFF ZERO WIDTH NO-BREAK SPACE has alternate BYTE ORDER MARK. Presentation: listed in character charts description. 5. Figment
This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (July 2019) (Learn how and when to remove this message) This article compares Unicode encodings in two types of environments: 8-bit clean environments, and environments that forbid the use of byte values with the ...
While UTF-8 does not have byte order issues, a BOM encoded in UTF-8 may nonetheless be encountered, and it is explicitly allowed by the Unicode standard[1], the Unicode standard does not specifically recommend its usage[2]. It only identifies a file as UTF-8 and does not state anything about byte order.[3]
A Unicode character is assigned a unique Name (na). [1] The name is composed of uppercase letters A–Z, digits 0–9, hyphen-minus and space.Some sequences are excluded: names beginning with a space or hyphen, names ending with a space or hyphen, repeated spaces or hyphens, and space after hyphen are not allowed.
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).
It may though require the user to change options from the normal settings, or may require a BOM (byte-order mark) as the first character to read the file. Examples of software supporting UTF-8 include Microsoft Word, [34] [35] [36] Microsoft Excel (2016 and later), [37] [38] Google Drive, LibreOffice and most databases.