So far the only explanation I've seen is the number of syllables. "Ten-eighty pee" and "seven-twenty pee" are relatively easy to say on the radio, TV, and sales

So far the only explanation I've seen is the number of syllables. "Ten-eighty pee" and "seven-twenty pee" are relatively easy to say on the radio, TV, and sales floor, but "twenty-one-sixty pee" starts to get unwieldy. Note that 2K (i.e. 1080p) has been used as a definition in the past [1], just very rarely, so it really is just the marketing of it that's changing. [1] https://en.wikipedia.org/w/index.php?title=2K_resolution&action=history https://en.wikipedia.org/w/index.php?title=2K_resolution&act...