Board Thread:General Discussion/@comment-32487879-20170330221056/@comment-25646419-20170330232046

Each Wiki can do its own emoticons. It was sometime in early to mid December where that emoticon was discussed, picked, and added in. For now "xD" will not put an emoticon. The face still exists, but you have to put "xd1" to get it to show up. (With or without capital letters. Doesn't matter.)

The emoticon you've linked to is added in as "xd2"