Final answer:
The frieze is the part of the classical entablature located between the cornice and architrave, often decorated with art in low relief such as in the Parthenon's Doric entablature.
Step-by-step explanation:
The horizontal part of a classical entablature between the cornice and architrave that is often decorated with sculpture in low relief is known as the frieze. In Greek temple architecture, the entablature is a significant structural element that rests horizontally atop the columns. It consists of the cornice at the top, the frieze in the middle adorned with artistic elements, and the architrave at the bottom. Particularly in the Doric order, the frieze is characterized by alternating panels of triglyphs and metopes. The triglyphs are decorative panels with three vertical grooves, and the metopes are square spaces that can contain sculpted or painted decorations. This style is prominently seen in the Doric entablature of the Parthenon, which boasts a frieze carved in low relief high up around all four sides within the colonnades.