Symbols (or notation) found in statistics problems fall into three main categories: math symbols, symbols referring to a population, and symbols referring to a sample.
Math symbols are easy enough to decipher with a simple review of algebra. They involve items such as square root signs, equations of a line, and combinations of math operations.
Population symbols are almost always lowercase Greek letters. They refer to the unknown population values that you're trying to estimate.
Sample symbols are almost always lowercase English letters with accents. They refer to the known statistics that are calculated from data.