念の為言っておくと、 YubiKey の yubi はおそらく ubiquitous のことであって指ではない
元というか、2つの意味をかけてるのね
About us | Yubico
https://www.yubico.com/about/about-us/
> We named our first product the YubiKey, with the vision of enabling your ubiquitous key to securely access any number of IT systems. In Japanese, the word “yubi” means “finger”, and by touching the YubiKey with your finger you verify your human presence, and that you are not a remote hacker.