Throughout the day, the aspect ratio of the OnePlus Pad 3 has been stuck in the back of my mind. Considering the 3392x2400 resolution. There had to be some reason for the seemingly arbitrary 3392 when it's an even 2400 in the other direction.
It's not quite 3:2, which would be 3600x2400
Definitely not 4:3, but it's not an in-between 5:4 ratio either.
Spec sheet says, 7:5, but that's not quite right either.
Turns out it's a √2 aspect ratio (~1.41). The exact same as a sheet of A4 paper.