Posgresql: UTF-8/UNICODE DB

Hello,

I'm trying to create  a postgres database on a FreeBSD 6.2 machine like this:

createdb  -E utf-8 -U pguser -p 5432 -h localhost mydb

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When I list the databses with "psql -l", I see:

       List of databases
    Name    | Owner | Encoding  
------------+-------+-----------
 mydb    | pguser  | UNICODE

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Why "UNICODE" and not UTF-8?

Thanks!