en.wikipedia.org/wiki/Vinculum_(symbol)

A vinculum is a horizontal line used in mathematical notation for a specific
purpose. It is most ... or the **bar notation** in common logarithms, such as. log 10
0.2 ...

en.wikipedia.org/wiki/Cutler%27s_bar_notation

In mathematics, Cutler's **bar notation** is a notation system for large numbers,
introduced by Mark Cutler in 2004. The idea is based on iterated exponentiation
in ...

en.wikipedia.org/wiki/Vertical_bar

**Notation**[edit] ... Version, a double vertical **bar** is used to mark margin notes that
contain an alternative translation from the original text.

intermath.coe.uga.edu/dictnary/descript.asp?termID=51

**Bar Notation**: The use of a horizontal bar over decimal digits to indicate that they
repeat. The bar above indicates that the 3 repeats forever. The bar represents ...

en.wikipedia.org/wiki/Bar_(music)

In musical **notation**, a **bar** (or measure) is a segment of time corresponding to a
specific number of beats in which each beat is represented by a particular note ...

study.com/academy/lesson/what-is-bar-notation-in-math-definition-examples.html

Some numbers with decimal points could go on forever. **Bar notation** is a way to
show a repeating number and is much quicker than writing all those...

www.easycalculation.com/maths-dictionary/bar_notation.html

**Bar Notation** : A **bar notation** is a process of writing the repeating decimals or
digits using bar symbol (over the repeating digits).