>¿J602a discriminate  Spanish? 

It is more accurate to say J discriminates (for) ASCII.  Unicode is a
second class citizen.  

Anyway, yours is a known issue.  The good news it that it has no impact on
the function of your J programs.  The problem is only in the display (of
boxed Unicode nouns in the session manager).  The problem was documented
on the Wiki at some point, but I can't recall where.  If you can find it,
I have vague recollections that a fix or workaround was outlined
(something to do with changing the font selected, maybe?).

But this is not the only trouble you may encounter with Unicode.  For
example:

           #'ó'
        2

It'll take some research and experimenting to get this right:

           # ucp 'ó'
        1

           datatype 'ó'
        literal

           datatype ucp 'ó'
        unicode

This page will help:  http://www.jsoftware.com/jwiki/Guides/Unicode  .

I've been struggling with this myself, recently (I'm trying to create a
quick ad-hoc report but am hampered because my data is in Unicode but I
don't know enough about that to diagnose the issue or normalize the data).
 I wish a character was a character was a character.

-Dan
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