?字UNICODE编码U+21020,10进制: 135200,UTF-32: 00021020,UTF-8: F0 A1 80 A0。(tTCX.net)
?字位于中日韩统一表意文字扩充B区(CJK Unified Ideographs Extension B)。(Zi.ttcx.NeT)
or; emphatic particle; (Cant.) particle implying doubt(Zi.ttcx.NeT)