ELI5: Explain Like I'm 5

Album graecum

An album graecum is a special book that can help people learn to speak and write in ancient Greek. This book has pages with columns that have lines and spaces for people to write letters and words in Greek. It also has a lot of information and rules that explain how to use the Greek language. It's like a big helper for people who want to learn Greek and become really good at it!