👉 In mathematics, a coiner is a term used to describe an object or idea that has been borrowed from another source and then modified in some way. This can be done by changing its meaning or replacing it with something else. For example, in probability theory, a coiner could be a random variable that was originally defined as the number of heads observed on an unfair coin toss. However, after being modified to include all possible outcomes (i.e., all possible values for the coin's bias),