A canon is a structured hymn used in a number of Eastern Orthodox services. It consists of nine odes, sometimes called canticles or songs depending on the translation, based on the Biblical canticles. Most of these are found in the Old Testament, but the final ode is taken from the Magnificat and Song of Zechariah from the New Testament. For clarity, this article will use the term "canticle" to refer to the original biblical text, and "ode" to refer to the composed liturgical hymns.