It seems you're referring to a phrase that combines Arabic words: "كتاب" ( kitab , meaning "book") and "رياضيات الثالث" ( riyadiyat al-thalith , meaning "mathematics of the third" — likely "third grade" or "third year").

A possible full transliteration: → "Third Grade Mathematics Book" or "Mathematics Book for the Third (Year/Level)."

If you meant a specific textbook title or curriculum reference (e.g., for third grade in an Arab educational system), please provide more context — such as the country (e.g., Egypt, Saudi Arabia, Algeria), the exact level (primary third grade, or third year of middle/secondary school), and any publisher or author name.