A manuscript that reflects the Masoretic tradition but is no longer extant though was cited by the Masoretes. It, alongside manuscripts like Codex Muga and Codex Jericho, was likely a prominent example of unpointed texts that had become part of a standardizing consensus in the first centuries A.D., laying the groundwork for the work of the Masoretes of Tiberias.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Texts and Manuscripts of the Old Testament by Mark R. Norton, Page 159)