Da Vinci Code the writing that can be backward and uside down it was on the beginning of the chapters?

The writing that appears backwards and upside down at the beginning of some chapters in "The Da Vinci Code" is called mirror writing. This technique was often used by Leonardo da vinci, which is fitting since his name features prominently in the title of the book. Mirror writing requires the reader to hold the text up to a mirror to decipher it.