The Roman-Yoshiki Warp Velocity Scale, often referred to as the Warp Scale, is an exponential scale designed by ACI astrophysicists Horia-Andrei Roman and Iwayanagi Yoshiki as means to accurately measure the velocities involved in warp travel. The scale is similar to the Richter scale regarding its nonlinear growth, although they differ as one represents a logarithmic function, while the other is strictly exponential. Currently, the scale is the primary means of warp speed measurement, and has since been included in the Universal System of Measurement.