I'm with you on the term "4K". I can't believe Slashdotters are complicit in this marketing nonsense. There's nothing "4,000" about it. We've been using lines as shorthand for display resolution for quite some time now, and it makes zero sense to switch to columns now, and it isn't even 4K columns.
Resolution: 3840x2160
Pixels: 8.3M
1280x720 is 720p/HD
1920x1080 is 1080p/FHD (Full HD)
2160x1440 is QHD (Quad HD)
Therefore 3840x2160 should be 2160p, QFHD, UHD, or 2K. 4K is utter nonsense. Calling it "Mega 8.3" would even be better.
It's like if Chevrolet said the new Corvette Z06 made over 1200 HP, because they started measuring torque in half-foot-pounds.