Supplementary Multilingual Plane

U+10000 – U+1FFFF  ·  Plane 1  ·  28,869 assigned characters

The Supplementary Multilingual Plane (Plane 1) covers U+10000–U+1FFFF and contains emoji, historic and extinct scripts (Linear B, Cuneiform, Egyptian Hieroglyphs), musical notation, mathematical alphanumeric symbols, and playing card suits. All characters here require a surrogate pair in UTF-16 and 4 bytes in UTF-8, which is why emoji have .length === 2 in JavaScript.

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