A bar (also referred to as an overbar) is a horizontal line written above a mathematical symbol to provide it some special meaning. If the bar is put over a single symbol, as in
1. The mean
of a collection
2. The complicated conjugate
3. The match
4. A collection stripped of any type of structure besides order, for this reason theorder form of the set.
In conventional typography, "bar" describes a upright (instead a horizontal) solitary bar such together those supplied to denote absolute value (
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Bringhurst, R. The aspects of Typographic Style, second ed. Point Roberts, WA: Hartley and Marks, p.271, 1997.
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