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Nonlinear optics — (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light. This nonlinearity is typically only observed… … Wikipedia
High-visibility clothing — High visibility clothing, a type of personal protective equipment (PPE), is any clothing worn that has highly reflective properties or a color that is easily discernible from any background. Orange hunting vests are a popular example of high… … Wikipedia
World Forum for Harmonization of Vehicle Regulations — The World Forum for Harmonization of Vehicle Regulations is a working party of the United Nations Economic Commission for Europe (UNECE). It is tasked with creating a uniform set of regulations for vehicle design to facilitate international trade … Wikipedia

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