The notes to pi in ancient literature from Han to Qing dynasties are quite different, so the concept of pi was not clear for a long time.

自汉代始，历代文献中对铍的注释存在很大分歧，以致长期以来铍的概念一直模糊不清。

youdao

On the basis of the method of fuzzy synthetical evaluation, the evaluation model and evaluation method have been established for the optimal pipe thickness of long-distance PI...

在分析影响长输管道安全系数的基础上，利用模糊综合评判方法，建立了确定长输管道最佳壁厚安全系数的评价模型及评价方法，并进行了实例分析。

youdao

They cited specific details, from format to font to details of name-calling and pi-reciting (which, of course, led to a long tangential discussion of pi and how to remember beyond the 46th digit, high or not).

FORBES: Connect

The two-month long competition was run by the foundation behind the Raspberry Pi and intended to find the best young programmers working with the bare-bones computer.

BBC: Time-lapse code wins Raspberry Pi contest

After all, if you were going to hide a long numeric message in the very fabric of our reality, pi would be a natural place to do it.

BBC: 3.14 and the rest