The unused portion of an open line of credit, such as a credit card or a revolving loan (such as a home-equity line of credit).

Amount of money lent to an individual (usually on a nonsecured basis) for personal, family, or household purposes: automobile purchases, home purchases, medical care, home

The loans to businesses; include commercial mortgages and corporate bonds. (source: http://en.wikipedia.org/wiki/Loan#Personal_or_commercial)

AAA is the highest issuer credit-rating assigned by a credit-rating agency (CRA)

Substitution of one party for another as a creditor or possessor of a legal right.