It’s a legend, but a fun one.

https://en.wikipedia.org/wiki/Pope_Joan#Legends

Some versions of the legend suggest that subsequent popes were subjected to an examination whereby, having sat on a so-called sedia stercoraria or ‘dung chair’ containing a hole, a cardinal had to reach up and establish that the new pope had testicles before announcing “Duos habet et bene pendentes” (“He has two and they dangle nicely”),[17] or “habet” (“he has them”) for short.[18]

@tias@discuss.tchncs.de ☝ the chair