| Rank | Abbreviation | Meaning |
|---|
| ***** | RED BOOK, THE. | A now-defunct hotel reference guide. The term is commonly used to refer to any hotel reference guide.
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| ***** | RED AND GREEN. | A system used by customs in which passengers with nothing to declare follow the green symbols, while passengers with dutiable items to declare follow the red symbols through the customs area.
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| ***** | RED BOOK. | Slang. Any restaurant and hotel guide published by Michelin, so called because of its color and to distinguish these guides from Michelin’s tourism guides, which have green covers. See also, Micheli
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| *** | RED LIGHT DISTRICT. | A part of a city set aside, either by municipal ordinance or informal custom, for prostitution and other sex-related businesses.
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| * | RED | Rapid Extraction Desk
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| * | RED | Reductant
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| * | RED | Resistive Exercise Device
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| * | RED | Reading Eye Dog
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| * | RED | Real Enterprise Development
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| * | RED | Radial Electron Distribution
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