As a footwear expert with years of experience in the industry, I can tell you that the "M" in shoe size typically stands for "Medium." This is a standard designation used to indicate the width of the shoe. Shoe sizes are often represented by a combination of letters and numbers, where the number represents the length and the letter represents the width. The most common width sizing includes "N" for Narrow, "M" for Medium (or Regular), "W" for Wide, and "XW" for Extra Wide.

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Typically it stands for the width of the shoe. M, I think stands for medium width, and W stands for wide width.read more >>