Originally Posted by twowheels
Don't forget those Kobo people who keep confusing us by posting threads with KT in the title, requiring us to look at the forum that it was posted it to figure out which KT we're talking about!
That is why we call it a K5, and not a KT. Because a K2 and DX use the same 2.x firmware, hardware differences (larger screen resolution) resulted in a different name for the DX. And the same will happen with the Paperwhite, where although it runs 5.x firmware, its larger screen resultion results in us calling it a PW in the Dev Corner forum.
So DX = K2 upgraded with "more pixels", and PW = K5 upgraded with "more pixels".
KT = Kobo Touch.
EDIT: In the Dev Corner, there is no hardware differences that software or firmware are concerned with, so they are both a K4 in the Dev Corner. But here where such esthetics do matter, K4S and K4B are more appropriate.