Definition:Floor Function/Notation

Definition
Before around $1970$, the usual symbol for the floor function was $\left[{x}\right]$.

The notation $\floor x$ for the floor function is a relatively recent development.

Compare the notation for the corresponding ceiling function, $\ceiling x$, which in the context of discrete mathematics is used almost as much.

Some sources use $\operatorname {fl} \paren x$ for the floor function of $x$. However, this notation is clumsy, and will not be used on.