The principle that states that something exists. I frequently use this formulation. Reality exists.¹ See PRINCIPLE (FUNDAMENTAL, PHILOSOPHICAL).

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Elaboration

As do the principles of identity, noncontradiction and causality, in my terms, the principle of reality provides a different vantage point on the fact that what is, is.

By my epistemological standards, the concept "reality" ultimately can be defined only ostensively.

Notes

¹In formulating the law of reality, I drew inspiration from Ayn Rand's "axiom" of existence, which she discusses in her novel, Atlas Shrugged, and in her nonfiction book, Introduction to Objectivist Epistemology.