31e43553__3__The_Metaweb_Query_Language__Character
[Escape] \uXXXX [Character] 
The Unicode character whose encoding is the four hexadecimal digits XXXX. To encode extended Unicode codepoints that do not fit in four hex digits, use two \u escapes to encode a UTF-16 surrogate pair.
MQL Reference Guide: Chapter 3. The Metaweb Query Language
Character