| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
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| r | radius | Academic & Science › Mathematics |  |
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| R | Right | Academic & Science › Language & Linguistics | |
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| R | South African Rand | Regional › Countries |  |
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| R | Resistor | Academic & Science › Electronics | |
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| R | electrical resistance | Academic & Science › Electrical | |
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| R | gas constant | Academic & Science › Chemistry | |
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| R | Real number | Academic & Science › Mathematics | |
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| R | Refrigerant | Academic & Science › Engineering | |
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| R | Reverse | Technology › Automotive | |
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| R | Reproduction number | Medical › Diseases & Conditions | |
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| r | are | Miscellaneous › Chat & Messaging | |
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| R | Reflectance | Academic & Science › Physics | |
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| R | spectral resolution | Academic & Science › Astronomy & Space Science | |
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| R | Racing | Technology › Automotive | |
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| r | coefficient of relationship | Academic & Science › Biology | |
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| R | Roentgen | Academic & Science › Units | |
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| R | Registered trademark | Business › Patents & Trademarks | |
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| R | Raipur Junction | Transport & Travel › IRCTC Station Codes |  |
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| R | Ricci curvature | Academic & Science › Mathematics | |
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| R | Ronna | Academic & Science › Units | |
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| r | ronto | Academic & Science › Units | |
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| R-Calif | Republican from California | Governmental › Politics |  |
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| R-CHOP | is named for the initials of the five drugs that work together to target and kill cancer cells | Medical › Treatments & Procedures | |
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| R&B | Rhythm & Blues | News & Entertainment › Music | |
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| R&B | Reed & Barton | Business › Companies & Corporations | |
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