Which famous technology company ran an advertising campaign centered around the mathematical constant π (pi) that included billboards showing the first several digits?

Mathematics and marketing might seem worlds apart, but some brands have cleverly incorporated mathematical concepts into their advertising campaigns. These campaigns not only showcase the beauty of mathematics but also make the subject more approachable to the general public. Test your knowledge of these mathematical marketing intersections!

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IBM with their 'Think π' campaign featuring 3.141592 on billboards in major tech hubs
Google, which posted the first digits of pi as a recruitment puzzle on a billboard in Silicon Valley
Texas Instruments, showcasing their calculator's precision with a 'Calculate π Day' campaign
Apple, with their 'iπ' campaign suggesting their products offer infinite possibilities