What is M 9 / W 10 in shoe size mean?

it means for Mens size for the shoe is 9 and the Woman's size for the shoe is 10 because men usually have bigger shoes than women so their smaller size numbers but the same size as a bigger size in woman's size because again men usually have bigger feet that need bigger shoes

1. a

2. b

3. d

4. d

5. b

6. b

7.b

8. a

9. d

10. d