Data Type Oracle PLSQL

SQL>
SQL> DECLARE
  2    d DATE := SYSTIMESTAMP;
  3    t TIMESTAMP(3) := SYSTIMESTAMP;
  4  BEGIN
  5    dbms_output.put_line('TIMESTAMP ['||t||']');
  6  END;
  7  /
TIMESTAMP [26-OCT-09 09.03.59.767 AM]
PL/SQL procedure successfully completed.
SQL>