In architecture, a tower, primarily ornamental, that also functions in Gothic architecture to give additional weight to a buttress or a pier."Pinnacle" can also refer to such a land feature as Arizona's beautiful Pinnacle Peak. It is depicted in see thumbnail to rightthe seal of the Paradise Valley Unified School District.Related link: The Glossary of Medieval Art and Architecture defines pinnacle and provides an illustration.Also see crocket, crown, and finial.