请讲解图中的概念---**1. Concept** The operation of finding the product of `n` identical factors is called exponentiation. The result of exponentiation is called a power. For example, `a * a * a * ... * a` (n times), is written as `a^n`, and read as "a to the power of n". In `a^n`, `a` is called the base, and `n` is called the exponent. When `a^n` is viewed as the result of "a to the power of n", it can also be read as "the n-th power of a". **2. Sign Rules for Exponentiation** (1) An odd power of a negative number is a negative number, and an even power of a negative number is a positive number. For example, `(-2)^3 = -8`, `(-2)^2 = 4`. (2) Any power of a positive number is a positive number. Any positive integer power of 0 is 0. For example, `2^2 = 4`, `2^3 = 8`, `0^5 = 0`. **Other Relevant Text (Important Note)** [Note] Distinguish between `-1^6` and `(-1)^6`: `-1^6` means multiplying 6 ones together, then taking the opposite number, resulting in -1. `(-1)^6` means multiplying 6 negative ones together, resulting in 1.