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ƒ loci[i] = the locus of the third vertex C such that the medians from A en C are orthogonal
 
lo·ci (noun)
plural form of locus.
 
  1. TECHNICAL
    a particular position, point, or place.
  2. MATHEMATICS
    a curve or other figure formed by all the points satisfying a particular equation of the relation between coordinates, or by a point, line, or surface moving according to mathematically defined conditions.