bitcoins are not coins, but a token is a better term.
remember a token is not like a casino chip (round piece of plastic) or a supermarket coupon (piece of paper)
a token has more meaning then that.
google 'session token' for instance
..
screw it ill spell it out for yousession token is a piece of data that is used in network communications (often over HTTP) to identify a session, a series of related message exchanges.
so bitcoins are closer to being described as a token rather than a coin