I recently discovered a wonderful unicode character that makes the following text reverse called right-to-left-override. For example: print "Hello[U+202E]World", produces the output: Hello dlroW. I'm not sure of what legitimate reason you would use the unicode character, but several blogs have warned that it can be used by malware writers to get people to click on files. Most people are wary that .exe files might be harmful, but extensions like JPG and other images are generally not. You can 'trick' a user into thinking a file is a JPG by using this special unicode character. If you named your malware executable ClickHer[U+202E]gpj.exe for example, you'd end up with a file called ClickHerexe.jpg.
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