It is $\pi$-day and the internet is full of stories about $\pi$. One story mentions that "an approximation -- $22/7$ -- is used in many calculations."
I have never actually used $22/7$ as an approximation for $\pi$ in a calculation ... or at least I don't have a memory of doing that.
My questions are
Is it true that today $22/7$ is an approximation that is used in many calculations? Are there, for example, any computers that use this approximation? Is $22/7$ in general (in the USA) often used in handcalculations that involve $\pi$?
I could imagine that before the widespread use of calculators, people would actually use $22/7$ as an approximation. Are there any historical examples of this?