N-body units
SYSTEM OF UNITS USED FOR N-BODY SIMULATIONS OF SELF-GRAVITATING SYSTEMS, IN WHICH THE TOTAL MASS, THE GRAVITATIONAL CONSTANT, AND THE VIRIAL RADIUS ARE ALL NORMALIZED
N-body units are a completely self-contained system of units used for N-body simulations of self-gravitating systems in astrophysics. In this system, the base physical units are chosen so that the total mass, M, the gravitational constant, G, and the virial radius, R, are normalized.