Show Hidden parameters 11g

Show DB 11g hidden parameters:

SELECT a.ksppinm "Parameter",
       b.ksppstvl "Session Value",
       c.ksppstvl "Instance Value"
FROM   x$ksppi a,
       x$ksppcv b,
       x$ksppsv c
WHERE  a.indx = b.indx
AND    a.indx = c.indx
AND    a.ksppinm LIKE '/_%' escape '/'
/

 select
   *
from
   v$parameter
where
   substr(name, 0,1) ='_';