What is the term used for the horizontal dimension of a flag?

The term used for the horizontal dimension of a flag is known as the "fly." This refers specifically to the part of the flag that extends away from the flagpole, and it is often measured from the hoist (the side of the flag attached to the pole) to the opposite end of the flag. The fly is important in flag design and usage, as it determines how the flag will appear when flying in the wind. Understanding this terminology is essential for anyone interested in naval customs, as flags have significant meaning and are used in various naval operations and ceremonies.