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A solid triangle standing for a rock.
Also known as: Boulder symbol orienteering, Control description boulder
The IOF control description symbol for a boulder, a distinct rock standing above the ground.
Marks a boulder as the feature carrying the control.
Contexts: Maps
Uses the same triangle the orienteering map uses for a boulder, so the description and the map share a shape and a competitor learns one thing twice over.
Contexts: Maps
A small solid triangle drawn in the feature column, matching the triangle used on the map itself.