ユニコード
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すべての文字体系と絵文字を含む、あらゆる文字にユニークな番号を割り当てる汎用文字符号化規格。
Unicode is the foundation of modern text computing. Before Unicode, competing encoding standards (ASCII, ISO 8859, Shift JIS, etc.) made international text exchange error-prone. Unicode provides a single, consistent mapping from numbers to characters.The standard defines over 154,000 characters spanning 168 scripts. Emoji are allocated primarily in the Supplementary Multilingual Plane (Plane 1), starting around U+1F600. The Unicode Consortium releases new versions annually, each potentially adding new emoji.
Unicode only defines *what* each code point means — the actual byte representation depends on the encoding form used (UTF-8, UTF-16, or UTF-32).