projective geometry

/P R AH0 JH EH1 K T IH0 V JH IY0 AA1 M AH0 T R IY0/
noun
  1. 1

    A branch of mathematics that investigates those properties of figures that are invariant when projected from a point to a line or plane

Source: https://en.wiktionary.org/wiki/projective%20geometry