1. 
   semi-magic square
   A square array of n numbers such that sum of the n numbers in any row or column is a constant (known as the magic sum). Related entry • magic square
   Found op http://www.daviddarling.info/encyclopedia/S/semi-magic_square.html
   
   
2. 
   Semi-square
   [astrological aspect] In astrology, a semi-square is an astrological aspect that two planets make when they are 45° apart from each other. The semi-square is considered to be the 8th harmonic of the chart because it is one-eighth of the 360° circle that the zodiac resides in (i.e., 360 / 8...
   Found op http://en.wikipedia.org/wiki/Semi-square_(astrological_aspect)
   
   
3. 
   Semiotic square
   The Semiotic Square, also known as the Greimas Square, is a tool used in the structural analysis of the relationships between semiotic signs. The Semiotic Square was developed by Algirdas J. Greimas, a Lithuanian linguist and semiotician and first presented in Semantique Structurale (1966) This boo...
   Found op http://en.wikipedia.org/wiki/Semiotic_square
   
   

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