It's called a split keyboard. It's used for a few different reasons but mostly ergonomics. By splitting the keyboard you can adjust the position of each side to fit the resting position of your hands. Also it makes you ten times cooler and improves your hacking abilities by about 30%

[–] MTK 5 points 14 hours ago

Also you can see that the keys are a little different than a normal keyboard. That is also for ergonomics and also for typing faster. So the keys are not diagonally aligned but actually vertically aligned. And you can see that they're a little bit stacked to align with the length of your different fingers.

[–] [email protected] 3 points 14 hours ago

It's either a lily58 or a sofle.

Both good kbs, but a few too many keys for me.

Be careful before you search for these - it's a very deep cave you are entering, and you may find youself stuck in the dark with solder burns and leftover PCB brns before you know it. Fun hobby though.