What is the meaning of VW_NSO_1 on an explain plan result (10gR2)

I verified that VW_NSO_1 is not a user defined view.
but it seems that oracle some how defines this object.
Any idea what this object is and how it is made use of?
PLAN_TABLE_OUTPUT
Plan hash value: 3445229878
| Id | Operation                       | Name                  | Rows | Bytes
|   0 | SELECT STATEMENT                |                       |     1 |    78
|   1 | SORT AGGREGATE                 |                       |     1 |    78
|   2 |   NESTED LOOPS                  |                       |     4 |   312
|* 3 |    HASH JOIN                    |                       |    40 | 2640
|* 4 |     TABLE ACCESS BY INDEX ROWID | SHIP_LOCN_DTL         |    40 | 1440
|   5 |      BITMAP CONVERSION TO ROWIDS|                       |       |
|* 6 |       BITMAP INDEX SINGLE VALUE | C_SHIP_FUNC_PLD_IND01 |       |
| 7 | VIEW | VW_NSO_1 | 2375 | 71250|* 8 |      FILTER                     |                       |       |
|   9 |       HASH GROUP BY             |                       |   119 |   111K
|* 10 |        HASH JOIN                |                       | 47493 | 2226K
|* 11 |         INDEX FULL SCAN         | C_SHIP_LOCN_DTL_IND3 | 47493 | 1669K
| 12 |         INDEX FULL SCAN         | C_SHIP_HDR_IND2       |   167K| 1964K
|* 13 |    INDEX RANGE SCAN             | C_SHIP_HDR_IND2       |     1 |    12

This is the name given by oracle parse for the view prepare during parse after join two tables.(C_SHIP_LOCN_DTL_IND3 and C_SHIP_HDR_IND2 ). And this is used for this parse only. For other time you can get some other name.

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kingfisher,
Ok one more link for you but I shall quote the text also here,
http://download.oracle.com/docs/cd/B19306_01/server.102/b14211/optimops.htm#i82005
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