Key command to format code

[Harry Putnam]

Pretty discouraged to be posting about this.  Somehow I've forgotten
the key combo to format a region of code.

I've been looking for it for 1/2 hour already.

C-h i m emacs
index search for `format'  no luck or I'm overlooking it.

C-h b (view all bindings) Then C-s for format... no luck

s (regex)  search with `format' and `format.*code' .. no luck

This command should be findable with the keyword of `format' and
maybe it is, but not for me.