The term 'Prominent Rock Pile' can be summarized as a large, noticeable pile of rocks. The crossword solution for this term is TOR, which is an acronym for a type of rock formation found in the British Isles. A TOR is a large, isolated hill or rock outcrop that is made up of granite and other igneous rocks. Tors are often found on the tops of hills and mountains and are usually surrounded by smaller rocks and boulders. They are prominent features in the landscape and are often used as landmarks.