What is the bar notation of 0.7777?

The bar notation of 0.7777 is written as 0.7 with a bar over the digit 7, indicating that the digit 7 repeats infinitely. This can be represented as 0.7¯, where the bar extends over the 7 to show that it repeats indefinitely. In mathematical notation, this is equivalent to the fraction 7/9, as the repeating decimal 0.7777 can be expressed as 7 divided by 9.