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[Actor]

I write programs that input data via command line arguments. Through experimentation I've found that the characters ^&<>| cannot be part of argument strings. The system interprets <> as redirection and | as the pipeline operator. However, I cannot figure out the other two. & appears to want to be followed by a program but I do not think it's another pipeline operator. ^ is just ignored. Why are ^ and & not usable in command line argument strings.