UVt

uvT is an acronym used in multiple disciplines with no single canonical meaning. The precise interpretation depends on context.

In optics and materials science, uvT commonly stands for ultraviolet transmittance. It describes the fraction of ultraviolet light that passes through a material at a given wavelength, typically expressed as T(λ) or as a band-averaged value. Measurement is performed with spectrophotometers or UV meters, across the UV-A, UV-B, and UV-C ranges. Applications include evaluating UV-blocking coatings, glazing, packaging, polymers, and sunscreen filters. Factors affecting uvT include material composition, thickness, surface finish, and aging.

In biology and ecology, uvT may denote ultraviolet tolerance, the capacity of organisms to withstand UV exposure. This trait is studied in plants, algae, and bacteria, relating to DNA repair efficiency, pigment production such as flavonoids, and protective behaviors. Measurements may involve growth, photosynthetic efficiency, or markers of DNA damage under UV stress.

In other contexts, the term may appear in mathematical or computational literature to describe a two-parameter transform or to label data in UV-related analyses. These uses are less standardized and not widely adopted.

See also ultraviolet radiation; transmittance; UV protection.