cairn

noun3

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: / Why speak ye no word!"—said Glenara the stern. — 1826
2. •
   A pile of stones heaped up as a landmark, to guide travelers on land or at sea, or to arrest attention, as in surveying, or in leaving traces of an exploring party, etc.

   • After fifteen minutes of this we were glad to reach a high saddle on which former travellers had piled little cairns of commemoration and thankfulness. — 1926
3. •
   A cairn terrier.