Is there a math word for an arbitrary expression positioned inside a pair of brackets?
You have divisors and dividends and exponents and subtrahends.
For an example take $3x^{\left\frac{2x}{5}\right\left\frac{2x+1}{2x-2}\right}.$ It's fair to say that in that expression, 3x is exponentiated to the product of the two expressions contained in each pair of parentheses. Is there an easier way to say "expression contained within a pair of parentheses"?