As a footwear expert with extensive knowledge in sizing systems, I can tell you that "D" in shoe sizes typically stands for "Medium." This is a classification used in the United States and some other countries to indicate the width of the shoe. The letter "D" is part of a standard width sizing system that includes other letters such as "A" for narrow, "B" for medium, "C" for wide, "D" for extra wide, and "E" for double extra wide.

In the context of shoe sizing, "M" usually stands for "Men's" or "Male." It is a designation used to differentiate between men's and women's shoe sizes, as they can vary significantly due to differences in foot shape and size.

So, when you see "D M" in shoe sizes, it generally means "Men's Medium width."

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The 2E width implies a wider shoe than 2D. In men, the standard width is D, while the widest shoe width is 4E. For women, the standard width size is B; But, the widest shoe is a D width. Considering that some men and women have slightly wider feet, shoe widths with a wider measurement has been implemented.read more >>