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Pi is (probably) an abbreviation for a Greek word meaning "perimeter" or "periphery" ... the original source is not exactly clear.
No, there are no ongoing patterns. There are some micro-patterns inside pi (such as 123456789) but they have no meaning.
22/7 No! It's a joke. There is no fraction value for pi. Pi is an irrational number, meaning that it cannot be represented in fractional form.
The digits of pi are not periodic. Pi is an irrational constant, and if its digits were periodic, it could be expressed as a ratio of constant integers, meaning it would be rational.
Pi is endless. Nobody can determine where the end is.