They are the password to the Secret Society in Arturus. Take the secret message from the Maid's room and go to the upper floor of the Mill. A girl will give you the card. Press the symbols, and the Sun, on the plaque on the village fountain.
The Cosmic Symbols are the password for the secret society. Use them to open the secret opening on the village fountain. Go to the fountain in the village. On the plaque, press the three symbols and...
Take the secret message (from the maid's room in the castle) to the Mill. Up inside the loft is a mysterious girl who will give you the new password for the secret society.
(Go to the fountain, press...
You get the Cosmic Symbols password from a girl in the upper part of the Mill. You will need the Secret Message (in the Princess's Maid's room, first floor left in the castle).
Go to the fountain...
If you follow the coordinates that the Queen gives you, there should be planets at those locations. The knights are on those planets (jungle, ice, and fire) and each has one of the Mystical Weapons...