Reference: Extensibility Types - System Defined Constants and System Defined Types

+-------------+--------------+----------------------+------+-----------+
|COLL_TYPE    |ELEM_TYPE_NAME|TYPE_NAME             |LENGTH|UPPER_BOUND|
+-------------+--------------+----------------------+------+-----------+
|TABLE        |NUMBER        |KU$_OBJNUMSET         |{null}|     {null}|
|TABLE        |NUMBER        |KU$_XMLCOLSET_T       |{null}|     {null}|
|TABLE        |NUMBER        |ORA_MINING_NUMBER_NT  |{null}|     {null}|
|TABLE        |VARCHAR2      |DBMS_AW$_COLUMNLIST_T |   100|     {null}|
|TABLE        |VARCHAR2      |DBMS_DEBUG_VC2COLL    |  1000|     {null}|
|TABLE        |VARCHAR2      |HSBLKNAMLST           |    30|     {null}|
|TABLE        |VARCHAR2      |KU$_VCNT              |  4000|     {null}|
|TABLE        |VARCHAR2      |ORA_MINING_VARCHAR2_NT|  4000|     {null}|
|VARYING ARRAY|NUMBER        |AWRRPT_NUM_ARY        |{null}|         30|
|VARYING ARRAY|NUMBER        |JDM_NUM_VALS          |{null}|        999|
|VARYING ARRAY|NUMBER        |ODCIGRANULELIST       |{null}|      65535|
|VARYING ARRAY|NUMBER        |ODCINUMBERLIST        |{null}|      32767|
|VARYING ARRAY|NUMBER        |SQL_OBJECTS           |{null}|       2000|
|VARYING ARRAY|NUMBER        |TABLESPACE_LIST       |{null}|      64000|
|VARYING ARRAY|VARCHAR2      |AQ$_JMS_NAMEARRAY     |   200|       1024|
|VARYING ARRAY|VARCHAR2      |AQ$_MIDARRAY          |    32|       1024|
|VARYING ARRAY|VARCHAR2      |AWRRPT_VCH_ARY        |    80|         30|
|VARYING ARRAY|VARCHAR2      |DBMSOUTPUT_LINESARRAY | 32767| 2147483647|
|VARYING ARRAY|VARCHAR2      |DBMS_XS_ROLELIST      |  1024|       4096|
|VARYING ARRAY|VARCHAR2      |FLASHBACKTBLIST       |    30|        100|
|VARYING ARRAY|VARCHAR2      |HSBLKVALARY           |  4000|        250|
|VARYING ARRAY|VARCHAR2      |JDM_ATTR_NAMES        |    60|        999|
|VARYING ARRAY|VARCHAR2      |JDM_STR_VALS          |  4000|        999|
|VARYING ARRAY|VARCHAR2      |KU$_DROPCOLLIST       |  4000|       1000|
|VARYING ARRAY|VARCHAR2      |KUPC$_LOBPIECES       |  4000|       4000|
|VARYING ARRAY|VARCHAR2      |ODCIRIDLIST           |  5072|      32767|
|VARYING ARRAY|VARCHAR2      |ODCIVARCHAR2LIST      |  4000|      32767|
|VARYING ARRAY|VARCHAR2      |RE$NAME_ARRAY         |    30|       1024|
|VARYING ARRAY|VARCHAR2      |RE$RULE_LIST          |    65|       1024|
|VARYING ARRAY|VARCHAR2      |SQLPROF_ATTR          |   500|       2000|
|VARYING ARRAY|VARCHAR2      |TXNAME_ARRAY          |   256|        100|
+-------------+--------------+----------------------+------+-----------+