For example, the aspect ratio of an earlier standard-definition (SD) screen was 4:3, which is a relatively square rectangle. The 4:3 means "4 to 3," or four units wide to three units high.

A non-square pixel used on TV screens. Pixels used in the North American TV standard (NTSC) are slightly wider than they are tall (12:11 aspect ratio). Pixels in the PAL and SECAM systems used ...

The GoPro HERO action camera now features a 4K 4:3 video mode and SuperView Digital Lens, enhancing ultra-wide immersive ...