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This symbol appears on a forest in an OS 1:50,000 Landranger map at SO 24799 27221. It doesn't appear in the map legend. It does not appear at the same point on the equivalent 1:25,000 Explorer map. What does it mean?
The mauve symbol is new, and represents "Natural Resources Wales".
This appears to be Open Access Land. It indicates the type of land bounded by a mauve outline (a fragment can be seen in your image).
It can be found on this Ordnance Survey symbols PDF.
Required, but never shown