String Fields will allow entry of essentially any characters. It is utilized typically for reference values between entries (ie - PROMOTION_COMBAT5 references or identifies the Combat 5 Promotion). But this can also be utilized to allow Float values.
Direct entry of text for display is typically considered poor form anywhere except in the Assets/Text folder. All entries elsewhere which shall be used to display information in-game ought to refer to an entry in the Text Folder. This allows multiple references to the same text information to all be updated/modified at a single location.