Cairn n a mound of rough stones built as a memorial or landmark, typically on a hilltop or skyline. • a prehistoric burial mound made of stones.

Buddhists build these over the years by each adding rock and making a wish or saying a prayer. They end up almost pyramidical, as the rocks have to get smaller and smaller to prevent toppling the cairn, and sometimes the top becomes a little cone of carefully balanced pebbles.

Also: libretto, tragus, frottage, chelicera, isthmus, alternating figure, brilliant cut diamond, butte, cheek retractors, cycloid, deerstalker hat, electrocardiogram.