- A collection of things. Such a collection is usually located together, and/or regarded as a unit. For example, a family of chemical elements with similar properties arranged vertically within a periodic table.
- In communications, a number of channels treated as a unit. For instance, a collection of associated voice channels in frequency-division multiplexing.
- In computers, a collection of elements regarded as a unit. For example, a set of records in a database.
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