Array of American Forces on the Field at the Battle of Breeds Hill.png

An array is a systematic arrangement of similar objects, usually in rows and columns.

Things called an array include:
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Music

* In twelve-tone and serial composition, the presentation of simultaneous twelve-tone sets such that the sums of their horizontal segments form a succession of twelve-tone aggregates
* Array mbira, a musical instrument
* Spiral array model, a music pitch space

Science

Astronomy

A telescope array, also called astronomical interferometer.

Biology

* Various kinds of multiple biological arrays called microarrays
* Visual feature array, a model for the visual cortex

Computer science

Generally, a collection of same type data items that can be selected by indices computed at run-time, including:

* Array data structure, an arrangement of items at equally spaced addresses in computer memory
* Array data type, used in a programming language to specify a variable that can be indexed
* Associative array, an abstract data structure model composed of key-value pairs, often implemented as a hash table or search tree
or various kinds of the above, such as:
* Bit array or bit vector
* Dynamic array, allocated at run time
* Jagged array, a multidimensional array where the rows have different lengths individually
* Parallel array of records, with each field stored as a separate array
* Sparse array, with most elements omitted, to store a sparse matrix
* Variable-length array

or various related concepts:
* Array programming, using matrix algebra notation in programs (not the same as array processing)
* Array slicing, the extraction of sub-arrays of an array

or also:
* Global Arrays, a library for parallel processing
* Intel Array Visualizer, a piece of scientific graphics software

Mathematics and statistics

* A standard array in coding theory
* An array or matrix (mathematics)
** a Costas array
** a Monge array
* A holor
* In statistics, arrays are a name for some kinds of :Experimental design
* Intersection array a concept of category theory

Technology

Computing

* Array data structure, an arrangement of data in computer memory
* Asynchronous array of simple processors
* Disk array, such as the RAID
* Gate array, including a field-programmable gate array (FPGA)
* ICL Distributed Array Processor, an array processor for the ICL
* Integrated circuit packages:
** Ball grid array
** pin grid array
** land grid array
* Processor array
* Programmable Array Logic (PAL), a systematic way to implement boolean functions
* Reconfigurable datapath array, a flexible data processing architecture
* Systolic array, a hardware architecture
* Transistor array, an integrated circuit
* Video Graphics Array (VGA), a display adapter and many variants thereof
* Wi-Fi array, a wireless networking device

Other technologies

* Antenna array
* Array gain, a telecommunications parameter
* Array processing of multichannel signals (not to be confused with array programming)
* Color filter array, placed over an imaging array
* Field emitter array, an electron source
* Halbach array, an arrangement of magnets
* Linear diode array used in image scanners
* Microphone array
* Parametric array of transducers
* Phased-array optics
* Photovoltaic array
* Staring array, an imaging sensor
* Towed array sonar

Other

* A Commission of Array, a commission for mustering a militia
* ARRAY, an independent film distribution company
* Array Networks, a computer networking company
*Array Collective, a Belfast-based artist-activist collaborative project