Array

A contaner of elements of the same type (and length) organized in a regular N-dimensional grid.

Axis

An index into the shape array. Many array functions take axis as an argument.

Dimension

(1) An axis; (2) The length of an axis; (3) The rank

Shape

A tuple containing the sizes of the grid.

Rank

The length of the shape tuple.

Index

An integer indicating position of an element along an axis of the grid. The index of the first element is 0.

Vector

An array of rank 1.

Matrix

An array of rank 2. Add more on NumPy? matrices

Tensor

An array, generally of rank greater than 2.

Scalar

An element in an array. Explain the difference between scalars and rank-0 arrays