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The column distinguishing one feature from its twins.
Also known as: Which feature column, Similar feature column
The IOF control description column stating which of several similar features nearby is the one carrying the control.
States which of several similar nearby features carries the control.
Contexts: Maps
Is empty when there is only one such feature, so an empty box is information: it tells a competitor there is nothing to confuse the feature with.
Contexts: Maps
The third square box of a description row, holding a small mark for a relative position such as northern, upper or middle.