I've just noticed something on Sina's hat. What's the difference between

　 ∧∧
／ 支 ＼
(　｀ハ´ )

(used in ttp://4-ch.net/ascii/kareha.pl/1112629846 for instance) and

　 ∧∧
／ 中 ＼
(　｀ハ´ )

(on this same thread)? Does this mean that there are two different Sinas?