This is a fun code system i used to do with my grandad when i was little. Its based on a tic tac toe system where square is the first 9, circel is the second, triangle is the third and X is the numbers. When you dont know the system it can be difficult to figure out but once you know it, its easy to send encrypted messages to people. In this set there are also the scandinavian letters Æ, Ø, Å and also W which is a combination of the individual letters. So W (v-v), Æ (a-e), Ø (o-e) and Å (a-a).