stock/bond for creditcard?

Dear-

As a newbie in financial market, I had a chance to the Dan Rather report as in


It shows that most credit card debt is a loan NOT by one BUT by numerous fund.
Also many mortgage is NOT a loan by one single BAC for example, BUT by SECURITIZED stock/bond.

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What is the symbol for such junk stock/bond, if I am interest in?
 
For example, if we have a $100K mortgage signed with BAC, it is not a money by BAC but by numerous lenders, if my understanding is correct.
 
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