Coin

A coin is a round circle object that is usually currency.

Currency

In currency, there are pennies ($0.01), nickels ($0.05), dimes ($0.1), quarters ($0.25), half dollars ($0.5), and dollar coins ($1).

Coin flipping

A coin flip is used like a 2 sided dice. One side is called "heads" and the other side is called "tales". A person may call heads or tails, then the person flips to see which side is it.