Oracle SQL Plan operation INLIST ITERATOR

drop   table tq84_A;

create table tq84_A (
   nm   number,
   tx   varchar2(200)
);

insert into tq84_A
select
   mod(level * 773, 1009),
   lpad('x', 200, 'x')
from 
   dual connect by level < 1009;

create unique index tq84_A_ix on tq84_A(nm);

begin
   dbms_stats.gather_table_stats(user, 'tq84_A');
end;
/

explain plan for
select
   tx
from
   tq84_A
where
   nm in (111, 222, 333, 444);

select * from table(dbms_xplan.display(format => 'basic +rows'));
--
-- ----------------------------------------------------------
-- | Id  | Operation                    | Name      | Rows  |
-- ----------------------------------------------------------
-- |   0 | SELECT STATEMENT             |           |     4 |
-- |   1 |  INLIST ITERATOR             |           |       |
-- |   2 |   TABLE ACCESS BY INDEX ROWID| TQ84_A    |     4 |
-- |   3 |    INDEX UNIQUE SCAN         | TQ84_A_IX |     4 |
-- ----------------------------------------------------------