What is 12 sigma?

12 sigma is actually 1.8 defects per 10^33 opportunities or if you subscribe to the bogus notion of the 1.5 sigma shift, it would be 4.3 defects per 10^26 opportunities. It is nonsense to talk about such things as no one would know how to measure or achieve such performance. The notion is only good for discussions when pontificating one's naval. 1.5 defects per million opportunities is the answer for 12 sigma. Its primarily used in the aviation industry.