There are similar versions to 2 of the symbols derived from the Fremen Alphabet (pictured here) being used in MeiroKodo's VOLUME II.
The Fremen Alphabet is an imaginary alphabet that was created for the movie DUNE, and doesn't actually exist. However, it is derived from Arabic, which we all know is a real language used today.
The code symbols that relate to the message you have to decipher in MeiroKodo are different in each volume. MeiroKodo does not have its own alphabet.
When was the last time YOU deciphered a secret code?