3.5K Scope. The 3.5K signifying that it is nominally 3500 pixels wide, and the Scope denoting that the aspect ratio is somewhere between 2.35:1 and 2.4:1 yielding a possible vertical resolution of between 1434 and 1464 pixels given the width of 3440 pixels.
Fixed that for you. the (x)K system goes by width, not height. Also, 5040x2160 is not even possible with DP1.2 or HDMI 2.0, so not really sure what that's doing in the list.
What will most likely appear larger than the 3440x1440 is a 4K Scope 3840x1600 display which is precisely a 2.4:1 aspect ratio. It would also be easily derived from existing 2560x1600 production, just as this 3440x1440 is derived from existing 1440 production.