why does "\" change parameter collection's parameter name?

Hello,

while naming a parameter in material parameter collection (parameter’s name field) i was typing the name as “1/2” ,“3/4” and then i typed “1/2\3/4” but it displayed the name after pressing the enter key as “1/204”

so i was wondering why

i am not into programming and source codes , so i don’t know if it’s an shortcut, bug, error or it doesn’t support ""

thanks for giving your time to my curiosity.