\begin{definition}[Definition:Binomial Coefficient/Notation]
The notation $\dbinom n k$ for the binomial coefficient was introduced by {{AuthorRef|Andreas Freiherr von Ettingshausen}} in his $1826$ work {{BookLink|Die kombinatorische Analysis, als Vorbereitungslehre zum Studium der theoretischen höheren Mathematik|Andreas v. Ettingshausen}}.
It appears to have become the ''de facto'' standard in recent years.
As a result, $\dbinom n k$ is frequently voiced '''the binomial coefficient $n$ over $k$'''.
Other notations include:
:$C \left({n, k}\right)$
:${}^n C_k$
:${}_n C_k$
:$C^n_k$
:${C_n}^k$
all of which can cause a certain degree of confusion.
\end{definition}