http://www.postgresql.org/idocs/index.php?app-psql.html
In psql \l (or \list) [...]. If your Postgres installation was compiled
with multibyte encoding support, the encoding scheme of each database is
shown as well.
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To support UNICODE, PostgreSQL needs to be compiled with the right options.
Currently, in 7.1, there is no way to know which encodings are available
server-side.
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Another info : there are holes between numbers:
12, 13, 14 and 15 return nothing. But:
16 -> KOI8
17 -> WIN
18 -> ALT
etc ...
Cheers,
Jean-Michel