In mathematics, because it is more troublesome to mark angles in the computer, it is designed as a symbol of power, such as 2 4 for 2? , which is 16.

In C++ programming, stands for XOR operation, that is, two numbers are bitwise XOR.

Of course, it can also be used in Yan characters, such as the simplest smiling face _, and other elements, such as (= ▽ =), (=? ェ? =) and so on