TRANSPOSITION ERROR is the unintentional exchange of two elements of an ordered list with all others staying the same. A transposition is therefore a permutation of two elements. For example, the swapping of 2 and 5 to take the list 123456 to 153426 is a transposition. In this example, if the newly ordered list of 153426 was unintentional, it would be commonly called a transposition error. In accounting, an error in copying a number from one place to another is a transposition error.