where-is

where-is is an interactive compiled Lisp function in `help.el'.

It is bound to C-h w, <f1> w, <help> w.

(where-is DEFINITION &optional INSERT)

Print message listing key sequences that invoke the command DEFINITION.
Argument is a command definition, usually a symbol with a function definition.
If INSERT (the prefix arg) is non-nil, insert the message in the buffer.