Name Kutub

Arabic name (كِتَابٌ) means - "book, letter, message, diploma".

Al Kutub al-Sittah "the six books". Six (originally was five, Ibn al-Qaisarani in the 11th century added Sunan ibn Majah to the collections) major Sunni collections of Hadith, wich Islamic theologians gathered about 200 years after the death of the Prophet Muhammad.