I have been wondering about ways to allow communication in internet communities (games and other social spaces) that are safe (not allowing personally identifiable information) and cross-lingual. I'd love to see an online game attempt to adopt a symbolic language such as this. The lexicon is small enough that you might not even have to type - just select the word you want from a nested menu.
Some people have started cross-linguistic communication with the huge sets of emoji that are now out there in Unicode (including telling stories!).
There are really no communication systems that are "safe" in the way you mean if their users can adopt codes that give new meanings to old symbols. For example,
I know I can't keep people from inventing their own compound terms for "loser noob", I just want to make it extremely difficult to for predators to get personal information.
