Have a look to this batch code. The unknown sign is the ASCII character 07. If you copy&paste; it to notepad and save as *.bat it should work.
ping -n 2 localhost>nul
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What's the character after "echo"? It shows up as a square with some symbols in it.
Yes, it is (in C++ at least). Include "\a" in your code (i.e. cout << "Hello world! \a";).