of the Protestant Old Testament, in which the material is divided into 39 books and arranged in a different order. This is due to the Tiberian Hebrew-Masoretic Text having been considered the "original" Hebrew text across Europe during the Renaissance. Biblical scholars within the Catholic Church started to treat these books differently due to this misunderstanding of the Masoretic Text, and Martin Luther took this understanding even further due to the ad fontes ("to the sources") principle of Renaissance humanism. Luther didn't know that the Masoretic Text was a recent edition of the Hebrew Bible when using it to justify removing 7 books from the Christian Old Testament. In addition to the Masoretic Text, modern biblical scholars seeking to understand the history of the Hebrew Bible use a range of sources. These include the Septuagint, the Syriac language Peshitta translation, the Samaritan Pentateuch, the Dead Sea Scrolls collection, and quotations from rabbinic manuscripts. These sources may be older than the Masoretic Text in some cases and often differ from it. These differences have given rise to the theory that yet another text, an Urtext of the Hebrew Bible, once existed and is the source of the versions extant today. However, such an Urtext has never been found, and which of the three commonly known versions (Septuagint, Masoretic Text, Samaritan Pentateuch) is closest to the Urtext is debated. The name "Tanakh" Tanakh is an acronym, made from the first Hebrew letter of each of the Masoretic Text's three traditional divisions: Torah (literally 'Instruction' or 'Law'), Nevi'im (Prophets), and Ketuvim (Writings)—hence TaNaKh. The three-part division reflected in the acronym Tanakh is well attested in the rabbinic literature. During that period, however, Tanakh was not used. Instead, the proper title was Mikra (or Miqra, מקרא, meaning reading or that which is read) because the biblical texts were read publicly. The acronym 'Tanakh' is first recorded in the medieval era. Mikra continues to be used in Hebrew to this day, alongside Tanakh, to refer to the Hebrew scriptures. In modern spoken Hebrew, they are interchangeable. The term "Hebrew Bible" Many biblical studies scholars advocate use of the term Hebrew Bible (or Hebrew Scriptures) as a substitute for less-neutral terms with Jewish or Christian connotations (e.g. Tanakh or Old Testament). The Society of Biblical Literature's Handbook of Style, which is the standard for major academic journals like the Harvard Theological Review and conservative Protestant journals