# What is the name of the 3D matrices?

The name of a variable in the $\mathbb{R}$ is called scalar.

Multiple scalars form a vector: $\mathbb{R}^n$

Two or more vectors form together a matrix: $\mathbb{R}^{n \times m }$

But what is the name of the 3 dimensional array of elments? ($\mathbb{R}^{n \times m \times k }$)

• It can be called a multidimensional array or in some cases a tensor of order 3. – mathreadler May 20 '16 at 17:01
• Hypermatrix – user137731 May 20 '16 at 17:08