The "Z" was once a trademark of "The Mark of Zorro", but is now replaced by a symbol of evil.
When I was a kid, I watched "The Mark of Zorro" on TV. After that, it became a movie in 1998. For those who don't know, here's a Wikipedia commentary.
That is, Z was a proof of justice. Now, it has come to be used as a sign of Russia's military strength, for unknown reasons. This article writes about why the Russian army uses Z.
It seems like a strange idea. If this reason is correct, I think they can simply write 77. The article also includes the results of a survey on the aggression that the Russian government calls a "special military operation."
Perhaps the Kremlin is promoting domestically with the mark Z that they are allies of justice? The propaganda seems to be successful in Russia.
Even in Japan, the tuned person immediately scribbled "Z".
There are those who refer to the generation born roughly from the mid-1990s to the early 2010s as Generation Z. Could the graffiti writers be Generation Z?
By the way, what happens after Generation Z? According to this article, the generation born after 2013 is Generation Alpha. It seems that such a concept of generation classification was created in the United States and used for corporate marketing.
The title photo is taken from "The Mark of Zorro" original soundtrack cover.