The internet solves the mystery:
I'm sure others will have pointed this out by now, but [these graffiti pictures] refer to a book by an Austrian mysticist named Guido von List, according to Wikipedia. The book, Das Geheimnis der Runen (ie, the graffiti in the first picture) continues to influence and inspire neo-Nazis, from which they derive the phrase "Sal und Sig" (the graffiti in the second photo) which I think means "Salvation and Victory."
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