Cairn /(?)/

Cairn

n.
  1. A rounded or conical heap of stones erected by early inhabitants of the British Isles, apparently as a sepulchral monument.
    Now here let us place the gray stone of her cairn.
    — Campbell.
  2. A pile of stones heaped up as a landmark, or to arrest attention, as in surveying, or in leaving traces of an exploring party, etc.