The term AVG. is an abbreviation for the mathematical concept of average, which is a measure of the central tendency of a set of numbers. The crossword solutions REG (3 letters), MED (3 letters), STD (3 letters), and NORM (4 letters) are all related to this concept. REG stands for regular, MED stands for median, STD stands for standard deviation, and NORM stands for normal. All of these terms refer to different ways of calculating the average of a set of numbers.