> The box represents your phone; the arrow pointing outside represents sharing/sending something from your phone to outside it (to Twitter, to another person et

> The box represents your phone; the arrow pointing outside represents sharing/sending something from your phone to outside it (to Twitter, to another person etc.) More specifically, the box represents the app running on the phone, and it shares content outside of the app. For example, you can "share" a picture from Safari into the Photos or Files apps to save it for later. It's a very, very leaky and ill-defined abstraction.