if you mean by bar notation..then it is a way of simplifying a specific number after the decimal that is repeated. How you simplify it is that you put a line over the repeating number.
For example: 0.3333333333333 would become 0.3 when you put a little line over the 3
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It is a generalization of the notion of a sequence used to define the notion of convergence in general topolopgy.
6,100,000,000
1.67x10^-6
1,000 = 1.0 × 103
500 = 5.0 × 102