Pluriad or Plurad: an umbrella term for all relationships involving more than two people, each of whom are in a relationship with all other members in it.

Similar to polyfidelity and polyad (which encompasses triad, quad, pentad, hexad, heptad, octad, ennead, nonad and decad), not to be confused with plurian. 

Coined with Fy, this would be also called plurisal or polisal in Portuguese (as in trisal and quadrisal). Based on triad/quad flags.

 -Ap