https://xkcd.com/243/ - HN isn't formal formal, but I think "nub" is perfectly reasonable.
Ok, I just sent this to all my ex-IBM colleagues. They were so shy at the time, +20 years ago, to say the little word "clit" in formal meetings, especially with customers. I think they used "the red dot mouse pointer thing" in formal settings. Informally, it was the eternal short name: "the clit".