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The recode reference manual

5.2 Universal Character Set, 4 bytes

Another surface of UCS uses exactly four bytes per character, and is a mere dump of the internal memory representation which is natural for the whole charset and as such, conveys with it endianness problems.

Use it as a genuine charset. This charset is available in recode under the name ISO-10646-UCS-4. Accepted aliases are UCS, UCS-4, ISO_10646, 10646 and u4.