braille tables in ios?

Hey there:
I am really confused about how to write some characters using the braille screen input.
Special characters like #, ( etc. I understand that there are different tables available, liblouis and system, for each language, but cannot find documentation or a full list of characters for each one.
I tried to find liblouis tables but I don't find anything useful like a refference and easy to read list.
Any resources on that?
Thanks in advance.