r
1. Abbr. for “radius.”
2. Abbr. for “right.”
3. Symbol for the capacity of a pile (for example, 3R indicates three times design capacity). 4. Symbol for the thermal resistance of a material or component of construction.
5. Symbol for electrical resistance.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.
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McGraw-Hill Dictionary of Architecture & Construction
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved.
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