In the film industry, we call that "portable" only if your definition of "port" involves a forklift.
This specific numerical string "1431" is a common shorthand among film enthusiasts for the 1.43:1 aspect ratio—the "tall" square-like format unique to IMAX 70mm film . Context of the Project In the film industry, we call that "portable"
: Created by combining widescreen footage from standard Blu-rays with full-frame sequences found in the The Dark Knight Trilogy Special Edition bonus discs. In the film industry