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Default behaviour of Ctrl-P on bash, fedora 26

I am trying to find documentation on the command issued by the key sequence Alt-P on bash. I can't find anything on it. After pressing it, a ":" appears on the command line, and every subsequent keystroke is typed literally, similar to what happen with the command showkey -a, until I type Ctrl-C. Is there a some utility that takes a key sequence and shows the command that it issues? Can anyone point to some documentation on this?