The Making of the Number Nine by Dudley and Albertus T. Dudley is a fascinating journey into the world of mathematics, where the authors cover the origin and development of the number 9 through the ages in different cultures and civilizations. They talk in detail about number systems in which the number 9 has a special meaning, about numerical symbols and their influence on society. This book is a fascinating exploration of the history and essence of the number 9, which turns out to be much more than just one count of ten. With insightful analyzes and interesting facts, "The Making of the Number Nine" not only expands our understanding of mathematics, but also encourages reflection on the global significance of symbols and numbers for human development.