There are quite a few of video formats (standards) that more or less make no sense, here are few examples:
240p, 360p, VGA, NTSC DV, NTSC D1, PAL, 1k Academy, HDTV 720p, HDTV 1080, 2K Academy, 4K Academy
I created a spreadsheet to keep track of the variety..
Bottom line is that we now the standard is 1080p and the new standard will be 4K.