What is the name of little squares pasta that are filled with meat cheese or spinach?

The little squares of pasta you're describing are called Ravioli.

Ravioli are a type of filled pasta that can be filled with a variety of ingredients, including:

* Meat: Ground beef, pork, lamb, or sausage

* Cheese: Ricotta, mozzarella, Parmesan, or even goat cheese

* Spinach: Combined with ricotta or other cheeses, often with a touch of nutmeg

* Other vegetables: Mushrooms, asparagus, or even pumpkin

Let me know if you'd like to learn more about different types of ravioli fillings!