Reply To: letter sign Home › Forums › Nemeth Code for Math and Science › letter sign › Reply To: letter sign September 8, 2018 at 12:55 am #31929 kdejuteModerator The book whose sections I referenced is the Nemeth Code itself, also known as “the green book.” More information about it (and other code books & resources) is here (that is a link) and on BANA’s website. Nicely done! –Kyle