This ACTS as a "signature" or "byte-order mark (BOM)" to identify the encoding and byte-order used in a file.

这作为一个“特征符”或“字节顺序标记(byte - order mark, BOM)”来识别文件中使用的编码和字节顺序。

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All three of these may or may not be preceded by a Unicode byte order mark in either UTF-8, big-endian UTF-16, or little-endian UTF-16.

所有这三行之前都可能有Unicode字节序标记，如utf - 8、big - endian UTF - 16或little - endian UTF - 16。

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