1. Plinth or fastigium, one placed over the apex and one over each end of a Classical pediment, left unadorned but often carrying a statue or other ornament. Those on each side are acroteria angularia.
2. Ornament or statue with no plinth in those positions, or ornament forming one object with its plinth at the apex and ends of a pediment.
3. Ridge of a Classical temple.
4. Horn or ear of an altar, stele, or sarcophagus.
"acroter." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 17, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/acroter
"acroter." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 17, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/acroter