SD has various meanings in the Ordnance Survey category. Discover the full forms, definitions, and usage contexts of SD in Ordnance Survey.
A number of yarns, twisted together and which in turn may be twisted into rope; a rope is stranded when a strain is broken; rope may be designated by the number of strands composing. Rope is commonly three-stranded. A vessel run ashore is said to be stranded.
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