Recovery mode

Recovery mode can be accessed in an iOS or iPadOS device by holding buttons while connected to a PC with iTunes or a Mac. It can also be triggered by a serious problem with the installed iOS software.

It can be exited by restoring it or reinstalling the iOS software on the device. It can also be exited by external software not necessarily supported by Apple.

History
The screen itself shows a symbol of a laptop or iTunes before iOS 13. Due to this, it was dubbed the "iTunes Screen" or "iTunes Screen of Death". By iOS 13, in the same era as macOS Catalina, It showed a laptop instead of an iTunes logo. It was then dubbed the “Laptop screen of Death”.

Articles

 * How to put your iPhone or iPad into recovery mode at iMore (2020-07-23)
 * How to put an iPhone into recovery mode by David Price at Macworld (2017-08-25)