Transposition error in the context of Typographical error

A typographical error (often shortened to typo), also called a misprint, is a spelling or transposition mistake made in the typing of printed or electronic material. Historically, this referred to mistakes in manual typesetting. The term is used of errors caused by mechanical failure or miskeying. Before the arrival of printing, the copyist's mistake or scribal error was the equivalent for manuscripts. Most typos involve simple duplication, omission, transposition, or substitution of a small number of characters.