The Mitchell principles are a set of guidelines for decision-making.

The dormitive principles are substances that induce sleep.

First principles are the fundamental concepts or assumptions that form the foundation of a theory or system.

First principles are the foundation of any method.

The anthropic principles suggest that the universe is finely tuned for the existence of intelligent life.

The equivalence principles are fundamental concepts in physics.

The Micawber principles are a set of financial principles that emphasize living within one's means.

The proximate principles are essential for understanding the basic functions of the human body.

The superposition principles are fundamental concepts in physics.

The pigeonhole principles state that if you have more pigeons than pigeonholes, at least one pigeonhole must contain more than one pigeon.