Unicode标准
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由Unicode联盟维护的完整字符编码体系，定义字符、属性、算法和编码形式。
The Unicode Standard is far more than just a list of characters. It includes character properties (is it a letter? a digit? right-to-left?), algorithms (bidirectional text, normalization, collation), and encoding forms (UTF-8, UTF-16, UTF-32).The standard is published as a book ("The Unicode Standard") and maintained as an online database. New versions are released annually, typically adding new scripts, characters, and emoji.
For emoji specifically, the Unicode Standard works with UTS#51 to define all aspects of emoji encoding, presentation, and behavior.