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== Index along an axis ==
Each of the values in an index corresponds to one [[axis]] of the indexed array. When considered in isolation, one of these values (a [[scalar]] number) is called an index ''along'' the corresponding axis. Selecting from the array using this index produces an array whose [[rank]] is one smaller than the initial array (and it cannot be done to a [[scalar]], as there are no axes along which to index). This array is sometimes called a "slice" or [[hyperplane]] of the array.
The set of possible
axes into an array as a whole is the [[wikipedia:Cartesian product|cartesian product]] of the possible indices into each axis.
== Index of a cell ==