# Talk:2586: Greek Letters

Pi also shows up in lots of extremely advanced equations as pi, not as something else, adding edit. 123.456.7890

zeta_0 is also used for the first transfinite ordinal that is unreachable through addition, multiplication, exponentiation, and epsilons subscripting. GcGYSF(asterisk)P(vertical line)e (talk) 05:11, 26 February 2022 (UTC)

Don't you have an English saying: **simple/easy as π**? Nukio (talk) 05:51, 26 February 2022 (UTC)

- the saying is
**easy as pie**as in the dessert. sometimes we write it**easy as π**as a nerdy joke. 162.158.107.230 08:08, 26 February 2022 (UTC)

Related: https://xkcd.com/2520/ 162.158.103.224 08:59, 26 February 2022 (UTC)

I've found a use for capital Xi: https://en.wikipedia.org/wiki/Harish-Chandra%27s_%CE%9E_function that seems to be from the field of Harmonic Analysis. Douira (talk) 14:50, 26 February 2022 (UTC)