How the PURGE INDEX command works

Hi all, 
PURGE INDEX command purges the specified index from the recyclebin. 
My question is: I noticed that the dropped index doesn't appear in the recyclebin, so from where it could be purged? 
SQL> CREATE INDEX Z_IND ON Z (Z);
Index created.
SQL> DROP INDEX Z_IND ;
Index dropped.
SQL> SELECT OBJECT_NAME , ORIGINAL_NAME FROM USER_RECYCLEBIN ;
OBJECT_NAME ORIGINAL_NAME
BIN$TNgWa0sgR8qFY7JXGVT3yQ==$0 T <<-- the dropped index doesn't appear here
SQL>CREATE INDEX Z_IND ON Z (Z);
Index created.
SQL> PURGE INDEX Z_IND ;
PURGE INDEX Z_IND
ERROR at line 1:
ORA-38307: object not in RECYCLE BIN
SQL> DROP INDEX Z_IND PURGE ;
DROP INDEX Z_IND PURGE
ERROR at line 1:
ORA-00933: SQL command not properly ended
SQL> DROP INDEX Z_IND;
Index dropped.

I found out that the index doesn't go to the recyclebin when it is dropped. It goes there, when its underlying table is dropped.
SQL> CREATE TABLE Z ( Z NUMBER );
Table created.
SQL> CREATE INDEX Z_IND ON Z(Z);
Index created.
SQL> DROP TABLE Z ;
Table dropped.
SQL> SELECT ORIGINAL_NAME FROM RECYCLEBIN ;
ORIGINAL_NAME
Z
Z_IND

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