This is a mathematical concept, which is defined as follows:

1, an integer with no 0 at the end, whose reverse number is the reverse output of each number.

2. The inversion of negative numbers is still negative.

3. An integer ending in 0 has the following inverse numbers: reverse( 1200) equals 2 100.

This concept is often used in programming and algorithms. For example, there is an integer 12345, and its inverse is 5432 1, because the numerical order of the original number is reversed. If there is a negative number-12345, its reciprocal is -5432 1, because although the number order is reversed, it is still negative.

If there is an integer 1200 with a zero at the end, then its reverse number is 2 100, because the order of non-zero numbers is reversed and the zero at the end remains the same. This concept can help people better understand and manipulate numbers when solving some specific programming and algorithm problems.