21inch
21inch refers to a measurement used to describe the diagonal size of a screen or display. In display technology, the size is typically defined by the diagonal length of the active viewing area, and 21 inches equals about 53.34 centimeters.
Historically, 21-inch displays were common for computer monitors and television sets. Many early CRT monitors used
In contemporary products, 21-inch class displays are still available, often marketed as around 21.5 inches or
Usage of the term 21inch is more common in model naming and informal references than as a