As for the meaning of X's and O's, here's one explanation:Even as little as a hundred and fifty years ago, not many people
could read or write. The "X" at the bottom of a document took the place
of a signature. They would kiss the "X" as a crucifix or bible was
kissed to emphasize the importance of the mark. It was this practice
that lead to the "X" representing a kiss.
O is an American thing and represents the arms wrapping around someone. 4951