1. a heap of stones built as a memorial or landmark, typically on a hilltop or mountain
Usage: chiefly British and Scottish; also spelled cairn

Examples

• The hikers built a small carn at the summit to mark their achievement.
• Ancient carns dot the Scottish highlands, serving as historical markers.
• We followed the carns along the mountain trail to stay on the correct path.
• The carn was constructed from local stones gathered by the community.