What does RA mean in Mathematics?

This page is about the meanings of the acronym/abbreviation/shorthand RA in the Academic & Science field in general and in the Mathematics terminology in particular.

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What does RA mean?

radium, Ra, atomic number 88(noun)
an intensely radioactive metallic element that occurs in minute amounts in uranium ores

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"RA." Abbreviations.com. STANDS4 LLC, 2016. Web. 22 Oct. 2016. <http://www.abbreviations.com/term/113149>.