Codex Sinaiticus (Greek: Σιναϊτικός Κώδικας, Hebrew: קודקס סינאיטיקוס; Shelfmarks and references: London, Brit. Libr., Additional Manuscripts 43725; Gregory-Aland nº א [Aleph] or 01, [Soden δ 2]) or "Sinai Bible" is one of the four great uncial codices, an ancient, handwritten copy of the Greek Bible. The codex is a celebrated historical treasure.[2]