Where’s the ESC Key?
Short answer: there isn’t one. But, there is a shortcut! If you’re somewhere that supports the Escape key function, simply hold the cmd key and press period (.). This will act as an ESC key.
In addition, you can modify some of the hardware keys under Settings > General > Keyboard > Hardware Keyboard. One of the options is to set a hardware key to function as an ESC key. So, if you never use the Globe key, consider changing it to something more useful. Personally, I’ll stick with the shortcut.