Conventions for describing Unicode data

When a specific Unicode UTF-16 code point is referenced, it can be expressed as U+n, where n is 4 to 6 hexadecimal digits. Leading zeros are omitted, unless the code point has fewer than 4 hexadecimal digits. For example, the following values are valid representations of a UTF-16 code point:

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  U+00001  U+0012  U+0123  U+1234  U+12345  U+123456 
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