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Three solid triangles together.
Also known as: Boulder cluster symbol, Control description boulder group
The IOF control description symbol for a group of boulders standing close together.
Marks a group of boulders standing close together as the feature carrying the control.
Contexts: Maps
Repeats the single boulder symbol rather than introducing a new one, so plurality is written by repetition and the vocabulary stays small.
Contexts: Maps
Three small solid triangles drawn as a group within one box.