MEMBER OF operator checks whether an element is in a nested table.
SQL> CREATE OR REPLACE PROCEDURE member_of_example AS
2 TYPE nestedTableType IS TABLE OF VARCHAR2(10);
3 myTable1 nestedTableType;
4 result BOOLEAN;
5 BEGIN
6 myTable1 := nestedTableType('F', 'G', 'S');
7 result := 'George' MEMBER OF myTable1;
8 IF result THEN
9 DBMS_OUTPUT.PUT_LINE('''George'' is a member');
10 END IF;
11 END member_of_example;
12 /
Procedure created.
SQL> CALL member_of_example();
Call completed.
SQL>