binary system

/B AY1 N ER0 IY0 S IH1 S T AH0 M/
noun
  1. 1

    Two gravitationally connected stars or other celestial objects which orbit around their center of mass.

  2. 2

    A numeric system with a base of 2, using only the numerals 0 and 1.

Source: https://en.wiktionary.org/wiki/binary%20system