It's a term of endearment, similar to "grandma's love" or "grandmotherly love" in English. It can be used in a few ways:
* To describe the kind of love a grandmother has for her grandchild: This is often seen as a particularly pure, unconditional, and nurturing form of love.
* To express affectionate feelings towards someone: You might call someone "amore di nonna" if you find them endearing and want to express your fondness for them.
* To emphasize the sweetness or tenderness of something: You might refer to a particularly delicious dessert as "amore di nonna" to highlight its sweetness and comfort.
Overall, "amore di nonna" carries a sense of warmth, affection, and comfort.