• A particular use of the special Unicode character, 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: the byte order, or endianness, of the text stream in the cases of 16-bit and 32-bit encodings; the fact that the text stream’s encoding is Unicode, to a high level of confidence; and which Unicode character encoding is used. ← Wikipedia

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