"Parker square" meaning in English

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          "ref": "2004, Mathematical Reviews, page 8484:",
          "text": "The use of Parker squares in the construction of sets of mutually orthogonal Latin squares is then examined.",
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          "ref": "2004, Ian M. Wanless, “Diagonally cyclic latin squares”, in European Journal of Combinatorics, volume 25, number 3:",
          "text": "A main class will contain a certain type of Parker square if and only if each square in the class is isotopic to a Parker square of that type.",
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          "ref": "2015, A. Donald Keedwell, József Dénes, Latin Squares and their Applications, →ISBN, page 287:",
          "text": "Thus, Parker squares of different types may lie in the same isomorphism class and, a fortiori, in the same isotopism or main class of latin squares.",
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        "A radially symmetric Latin square."
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  "word": "Parker square"
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        "A radially symmetric Latin square."
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  "word": "Parker square"
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