Money has many characteristics but I think the most important one would be common acceptability. The functions of money are common medium of exchange, store of wealth, measure of value/wealth, means...
General Acceptability - it should be generally accepted by everyone.
Divisible - this is important so that the goods in smaller quantities could be purchased.
Transportability - credit money issued...
We may have a little trouble with the 'unique' attributes here as you may find places in the realm of life where everything is copied.
Camera and Compound eyes. (Plants do follow the sun in their...