Louis Vuitton Shoes Size Chart Help!

[redrouteone]

This is from an LV shoe chart. The letters u are asking about refer to width of the shoe:
View attachment 4880149
I hope this helps !!

Thank you so much!
Large=wide

 

[Ciela]

What is a size 7? 37, 38??? Help!

size 7 is a 37.5 imo.
For reference, I am a 7 in Stuart Weitzman, a 7.5 in Tory Burch, a 37.5 in LV, and a 37 in Hermes.