Particle Theory is its name.
Trait theory
The Theory of Relativity.
The theory of relativety
The Big Bang Theory
the nebular theory
continent drift
Galileo theory
The Theory of Plate Tectonics?
the Pythagorean Theorem got its name from the man Pythagoras who came up with the theory.
The name of the theory that Schleiden and Schwann developed is the cell theory.
An economic theory is a theory that has to do with the production, distribution and consumption of goods and services.