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This question already has an answer here:

How do I pronounce R² as seen in chemistry formulas or maths? I can pronounce it as "R-square" but what other word is there for "square"?

marked as duplicate by RegDwigнt May 18 '14 at 13:29

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In this case, if 2 is above R, then it can be termed as:

Superior character or Superscript

Or if the 2 is below R, then it can be termed as :

Inferior character or Subscript.

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    The OP asked how it's pronounced, not what the technical term for it is. – Erik Kowal May 18 '14 at 4:30
  • @ErikKowal read his last sentence... "I can pronounce as R square but what other word for square?" – Invoker May 18 '14 at 4:43
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Try "R squared", "R raised to the power two", or "R to the power of two".

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In chemistry, the number is pronounced as usual. H2O2 is pronounced "H two O two".

In maths, it is different. You need to know what the function of the number is. 2 can be "two", or "squared" or other names.

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In mathematics, a common short form of "R to the power of two" is "R to the two" (but not "R to two"). This expression is used for general powers (x^7, 2^6, e^x, etc.), whereas for powers 2 and 3 one usually uses "squared" and "cubed".

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