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• Unicode Transformation Format 8-bit is a variable-width encoding
• It can represent every character in the Unicode character set.
• It was designed for backward compatibility with ASCII and to avoid the complications of endianness and byte order marks in UTF-16 and UTF-32.[1]
• Squeak and Pharo use UTF-32 internally and UTF-8 is the default format when reading and writing files.

References

• [1] http://utf8everywhere.org/

See also

• UTF8TextConverter
• More about Unicode.
• More Unicode terms
• UTF-32