Different sort order btwn Linux and Windows

I'm running the following SQL commands on a new PostgreSQL 9.0 database, one
on Linux, one on Windows.

create table i (j varchar(4));
insert into i (j) values ('A'), ('E'), ('<C P'), ('F');
select j from i order by j asc;

On the Windows server I get the following:

----
<C P
A
E
F
----

On the Linux server, I get this instead:

----
A
<C P
E
F
----

Can anyone tell me why the sort order would come out differently?

Thanks,
--
Doug Gorley | doug(dot)gorley(at)gmail(dot)com