Well, the twelve days of Christmas gifts refer to the gifts received by the protagonist in the song "The Twelve Days of Christmas." They are as follows:
On the first day of Christmas, my true love gave to me, a partridge in a pear tree.
On the second day of Christmas, my true love gave to me, two turtle doves and a partridge in a pear tree.
On the third day of Christmas, my true love gave to me, three French hens, two turtle doves, and a partridge in a pear tree.