me·men·to mo·ri

/məˈmenˌtō ˈmôrē/

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noun

1. an object serving as a warning or reminder of death, such as a skull."he placed the picture in his room as a memento mori"

The skull bead on a rosary is meant to provide a focus for contemplating one's mortality. A memento mori rosary reminds us of our mortality and that we will one day die and stand before the Lord Jesus, our soul awaiting His judgment.