At least some of the characters aren't:
Code:
UTF-8 "\xEF\xBF\xBE" does not map to Unicode at ....
Apparently, it's a codepoint for U+BFBE. But that's not helping at all

It appears out of nowhere in the middle of a few words. Rather odd. E.g. in the piece of code in the first post it's between Auf and deckung.
EDIT: Just checked and it appears in two different books within the cititations. One book is scanned and OCR'ed, the other is a PDF with only text within. So it seems that the source is Onyx Boox's export code.