To add to the correction someone else posted: It’s pretty rare that you’ll see 4x4/4wd vehicles with three sticks. The example you gave is from a Lada Niva where you can lock the center differential without engaging low gears or engage low gears without locking the center differential. Most 4wd vehicles will just have a second stick with 4wd, 4wd lock, 4wd low.
To add to the correction someone else posted: It’s pretty rare that you’ll see 4x4/4wd vehicles with three sticks. The example you gave is from a Lada Niva where you can lock the center differential without engaging low gears or engage low gears without locking the center differential. Most 4wd vehicles will just have a second stick with 4wd, 4wd lock, 4wd low.