Data types in a view

Is there actually a TIME data type in Oracle? What is the data type of null? Boolean is a number or is it?

SQL> create view v as
  2  select null nul
  3       , time '12:00:00' tim
  4       , dbms_session.is_role_enabled('CREATE SESSION') boo
  5   from dual
  6  ;

View created.

SQL>
SQL> select column_name,data_type,data_length
  2    from user_tab_columns
  3   where table_name = 'V'
  4   order by 1
  5  ;

COLUMN_NAME  DATA_TYPE    DATA_LENGTH
------------ ------------ -----------
BOO          NUMBER                22
NUL          VARCHAR2               0
TIM          TIME(9)               20

SQL>
SQL> select nul from v;

N
-


SQL>
SQL> select tim from v;

TIM
--------------------------------------------------------------
12:00:00,000000000

SQL>
SQL> select boo from v;
select boo from v
                *
ERROR at line 1:
ORA-06552: PL/SQL: Statement ignored
ORA-06553: PLS-382: expression is of wrong type

null and time types from Laurent Schneider.