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How does '-' work in bash redirection?

I have seen this explained somewhere before but can't find a reference now. An example usage from docker getting started guide for Ubuntu: curl -fsSL https://download.docker.com/linux/ubuntu/gpg | ...
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Uunderstanding the redirections in this command? [duplicate]

I found a magic command here ./my.sh 3>all 1> >(tee out >&3) 2> >(tee err >&3) I am confused at some places: Does 3>all mean setting the file descriptor 3 for file ...