Final answer:
The jagged feature formed by glaciers sculpting rock on three or more sides is known as a horn, a sharp, pyramid-shaped peak resulting from the erosion by cirque glaciers.
Step-by-step explanation:
The jagged feature that is a result of glaciers sculpting the rock on three or more sides highlighted by this placemark is known as a horn. These are sharp, pyramid-shaped peaks that form when several cirque glaciers erode a mountain from different sides. An example of a famous horn is the Matterhorn in the Swiss Alps. Glaciers leave a significant imprint on the landscape by scratching, grinding down rocks, and transporting debris, altering the terrain substantially over time. Features like horns, U-shaped valleys, and moraines are common in regions previously or currently occupied by glacier activity, evidencing the powerful erosional forces at work.