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Tetrad (area)

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A tetrad is an area 2 km x 2 km square. The term refers to any of the 25 such squares which make up a standard hectad.

The term comes from the Greek word tetras meaning "four".

Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentiality about their data, though the system is not in universal use.

The tetrads are labelled from A to Z (omitting O) according to the "DINTY" system as shown in the grid below, which takes its name from the letters of the second line.

E J P U Z
D I N T Y
C H M S X
B G L R W
A F K Q V

References

  1. ^ "DINTY Tetrads". Kent and Medway Biological Records Centre. Archived from the original on 27 May 2011. Retrieved 23 December 2008.
  2. "Collins English Dictionary". Retrieved 9 February 2024.
  3. "National Grid References". Sussex Biodiversity Record Centre. 2008. Retrieved 23 December 2008.


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