The law of conservation of matter doesn't really have another name. It's a fundamental principle in chemistry and physics, and its name accurately describes its core concept.

However, you might encounter related terms like:

* The law of conservation of mass: This is essentially the same concept, but specifically focusing on the mass of matter. It emphasizes that the total mass of the reactants in a chemical reaction must equal the total mass of the products.

* The law of indestructibility of matter: This term highlights that matter cannot be destroyed, only transformed into different forms.

While these terms convey similar ideas, "the law of conservation of matter" is the most widely recognized and preferred terminology.