remember-region
remember-region is an interactive compiled Lisp function in `remember.el
'.
(remember-region &optional BEG END)
Remember the data from BEG to END.
It is called from within the *Remember* buffer to save the text
that was entered.
If BEG and END are nil, the entire buffer will be remembered.
If you want to remember a region, supply a universal prefix to
`remember' instead. For example: C-u M-x remember RET.