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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See also
Look up hectad in Wiktionary, the free dictionary.References
"Recording a square: hectads, tetrads, monads, DINTY… – Cumbria Botany". Retrieved 2024-07-27. http://www.cumbriabotany.co.uk/the-flora-of-cumbria-recording-group/dinty-designation-of-tetrads/ ↩