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:''This page is about the array theory concept. See [[Indexing]], [[Indices]], [[Index Generator]], and [[Index
of]] for operations named after indices.''
In the APL [[array model]], an '''index''' is a [[vector]] of integers which indicates an [[element]] of an array. The term "index" may also refer to a [[scalar]] index ''along an [[axis]]'', or (particularly in [[leading axis theory]]) the index of a [[cell]]. Indices are subject to [[index origin]] in languages which have such a concept.