U.S. National Library of Medicine
That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.
The numerical value of ultraviolet rays in Chaldean Numerology is: 4
The numerical value of ultraviolet rays in Pythagorean Numerology is: 2
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"ultraviolet rays." Definitions.net. STANDS4 LLC, 2018. Web. 20 Feb. 2018. <https://www.definitions.net/definition/ultraviolet rays>.