magic square

a table of numbers with the same amount of rows and columns, in which the sum of each column, row, or main diagonal is always equal to the same number

See magic square in American Heritage Dictionary 4

noun
  1. A square that contains numbers arranged in equal rows and columns such that the sum of each row, column, and sometimes diagonal is the same.
  2. A similar square containing letters in particular arrangements that spell out the same word or words.

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magic square

top: the SATOR letter square

bottom: the number square from Albrecht Dürer's engraving

Melencolia I

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