56×17

56x17 refers to a specific product size, most commonly associated with paper or envelopes. The designation indicates dimensions in inches, with the first number representing the width and the second number representing the height. Therefore, 56x17 describes an object measuring 56 inches in width by 17 inches in height. This is a very large format, suggesting applications such as large posters, banners, or industrial paper rolls. In the context of envelopes, this size would be highly unusual for standard mail and might be used for oversized documents, architectural plans, or specialized packaging. The exact nature of what "56x17" refers to is dependent on the industry or product category it is applied to. Without further context, it is best understood as a measurement of size.