The symbol employed in textual criticism for the Codex Bezae, a 5th‐cent. MS of the gospels and Acts in Greek and Latin, presented to Cambridge University library by the Calvinist theologian Theodore Beza in 1581. It is the principal representative of the Western text.

D is also a symbol employed in OT source criticism for the Deuteronomist, and for the Deuteronomic Code (Deut. 12–26), which is sometimes thought to be the book apparently found in the Temple in 621 BCE and presented to King Josiah (2 Kgs. 22: 10). It requires the suppression of Canaanite cults (Deut. 12).