1366 x 768, also known as HD (High Definition) resolution, is the native screen resolution of the original 10.6-inch Surface RT and Surface Laptop SE. Unlike the rest of the Surface family, it has a legacy 16:9 aspect ratio display.
It has a total amount of only one megapixel and 100% default scaling. Despite having a larger display Surface Laptop SE models have a bit lower 135 PPI compared to 148 PPI on Surface RT.
You can learn more about screen information for all Surface devices from the Surface display comparison table we made here.