Cash would include outstanding deposits, petty cash, and money on deposit. Often cash and short-term deposits like treasury bills are presented together as they are both highly liquid, although technically a short term deposit is an investment.
A negative cash position is sometimes called a bank overdraft, although the phrase "cheques in excess of bank balance" can also be used to indicate the negative cash position is not caused by an overdraft at the bank but by outstanding cheques.
Cash that is restricted or appropriated for uses other than current purposes should be classified outside current assets except where it offsets a current liability. (1540.07)