The expression "i=2" indicates that the variable i is assigned the value of 2. In programming and mathematics, this is a common way to define or initialize a variable. The value can be used in calculations or to control the flow of a program. In many programming languages, such as Python or Java, this assignment allows the variable i to represent the number 2 throughout the code. This can be useful for loops, conditions, or any situation where you need to reference the number 2 without typing it repeatedly.