Talk about usless trivia... Some tine ago I needed to find out what you called that thing on old fashioned phones that indicated the phone was 'hung up' and the call completed.
A retired Bell technician that drove for me provided the answer (pre search engine era).
Depending on where you are and when you are writing about it's called either a switchhook or a hook-switch.
Most homes in the US (if they still have a land line, most millenials don't bother anymore) mostly use cordless phones these days, which have and 'off' button to end your call, much like a cell phone. You can also hang up some modles by returning the handset to the base/charging unit.
The major advantage of the old Bell System Phones is that they still work when you have no power. Most cordless phones don't. Even most modren replacement land line phones don't work with the power out.
I still have a pair of Western Electric 'Touch Tone' model 2500 phones, the type that used to be leased to residential customers in the US (they were not available for purchase until the Bell System monopoly was broken up by court order.)
I always kept one in my bedroom, because they were so much louder than modren phones and could wake me up from a dead sleep no matter how tired I was. That was necessary because I was on 24 hour call for 17 years when I woked for a courier company.
My parents still have a Western Union Model 500 rotary dial phone. It still works, but you have to let the phone company know you have a phone in service that uses pulse rather than tone for dialing out.
John