I originally had "yx" as display name (when Stack Overflow still allowed 2 character display names). I did not change it, but I now see my display name contains a dot. Why was this change made?
Even Jeff said I could retain it; yet, somehow it was changed without my knowledge.
TM
(the guy who posted that question you linked) also has a period added to his name. Looks like a policy change?belisarius.廌
. At least according to the Unicode database that's valid.