1920 x 1080 pixels, progressive scan. It's usually denoted 1080p.
People (in Oz at least) have been in the habit of calling anything over 576i
(576 lines of pixels with interlace scan) - the old TV standard - "HD". To
smooth out the convoluted nomenclature, they introduced "Full HD" and now
U(ltra) HD, which is 3840 x 2160, or just 2160p...

It goes on from there, but...