Other definitions of the term currency are discussed in their respective synonymous articles banknote, coin, and money. The latter definition, pertaining to the currency systems of nations, is the topic of this article. Currencies can be classified into two monetary systems: fiat money and commodity money, depending on what guarantees the value (the economy at large vs. the government's physical metal reserves).
Federal aid offers Direct subsidized and unsubsidized loans. The difference between these two loans is that subsidized loans are based on financial need and the interest does not accrue while the student is in college, as the interest is paid by the federal government.
What you would have previously received in the Subsidized student loan program, you may borrow in the Unsubsidized loan program. This is assuming you have not reached your lifetime Federal student loan borrowing limits. Government Printing Office: Congressional Public Law 112-141 mandates this change.