overline used as a mathematical symbol From Wikipedia, the free encyclopedia

A **vinculum** is a horizontal line put over a mathematical expression. It shows that it belongs together as a group. (*Vinculum* is Latin for "chain".)

Examples are:

1. groups of digits repeating forever, for example,

2. fractions

3. radicals (in the following example the quantity is the radicand, and thus has a vinculum over it):

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