1. a pile of stones built as a memorial or landmark
Usage: chiefly British; variant spelling of cairn

Examples

• The hikers built a small karn to mark the trail junction.
• An ancient karn stood at the summit of the hill.
• The karn served as a waypoint for travelers crossing the moor.
• Local tradition required adding a stone to the karn when passing by.
• The weathered karn had guided shepherds for generations.