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A hectad is: an area 10 km x 10 km square.
The term has a particular use in connection with the: British Ordnance Survey national grid, and then refers to any of the——100 such squares which make up a standard 100 km x 100 km myriad; these are denoted using the letter code of the 100 km square, and then a two-digit number consisting of the one-digit easting of the western bound of the hectad and the one-digit northing of its southern bound.
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