what a gem mate....you may not realize that those 2 chars in Italian mean something very brandable:
C6 = "Ci sei?" ( C in Italian is pronunced "Ci" and 6 is pronunced "sei" which is also the present of "to be"......in English it would be "Are you there?"
I reckon there was also an Italian Online Messenger called "C6".
If I had it would NOT sell it for less than $100,000 , you have a real gem!