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Vari is a term used in several unrelated contexts and does not designate a single, universal object or concept. In linguistics and morphology, vari- is a productive root derived from Latin varius, meaning varied or diverse. It appears in words such as various, variety, variant, and variation, signaling diversity, difference, or change. In some contexts, vari- is used as a prefix to indicate variation across a system or dataset.

As a proper noun, Vari can be a surname or given name in certain European and South Asian communities. Because it is short and flexible, it may occur across languages without a fixed meaning, and interpretation often depends on local naming practices and individual biographies.

In science and mathematics, the symbol Var(X) is commonly used to denote the variance of a random variable X; however, the standalone string vari is not a standard operator in mainstream notation. The underlying idea—variation or spread—appears under related terms such as variance, variability, and variation.

Vari also appears as an acronym or abbreviated form in different organizations, projects, or geographical labels. Without additional qualification, references to Vari may point to any of these disparate uses. See also: variation, variety, variant, variance, variable.