4K resolution
As noted above, DCI 4K is 40962160, while 4K UHD is 38402160, producing a slight difference in aspect ratio rather than a significant difference in resolution. Traditional displays, such as LCD or OLED, are 3840 pixels across the screen, with each pixel being 1/3840th of the screen width. They do not overlap—if they did, they would suffer reduced detail. The diameter of each pixel is basically 1/3840th of the screen width or 1/2160th of the screen height - either gives the same size pixel. That 38402160 works out to 8.3 megapixels, the official resolution of 4K UHD (and therefore Blu-ray UHD discs).
4K! – Fourth Republic!
The 4K! – Fourth Republic! (), often abbreviated 4K!, was a social-democratic political party in Hungary. It was led by András Istvánffy. It was formed at a Congress in April 2012, and its membership was largely drawn from a predecessor civil organization, also called 4K!.