Ultraviolet A very high frequency light that is beyond the visible range. The light is harmful to people and can cause plastics to age prematurely.
Upside down A term used to indicate when something is not in the expected orientation. A car is upside down if it has turned over with the top against the ground.
Urea-formaldehyde foam A foam often used for insulation in walls and or attics. The material is very soft and fragile so it must be protected when in use.
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