For me its the ‘Knock Code’ that LG had on their phones (I really wish LG still made at least the V series phones)
Basically there was a four-square area and you set up a sequence of where you would tap to unlock the phone. That set of squares was only shown when you set up the code
Then, to unlock your phone, you would tap those areas in the sequence you set up (even with the screen off).
Fingerprint readers are nice, but I really do miss the knock code
Edit: did find this article with a way to do the knock code, but if done wrong, could brick your phone I guess.
Plus, article is from 2014. When I looked at XDA’s info on it (they also being the developers) it looks like development on it is over, but individual modules may or may not still be supported by their devs
I missed how I could set an alarm and then shut my blackberry off overnight and the phone would turn itself back on in the morning to alarm
My Zenfone does this still!
The original Moto G did this as well, then I replaced it with the latest G5 which did not and learn that the hard way
It’s really annoying how some features like this are so useful but not sexy so they get discontinued silently. And no one makes a big uproar about it because it happens constantly
Any PC can do that