  One parameter scaling of the Hall coefficient of cuprates has been well known
for almost three decades, but still lacks a simple mathematical expression.
Motivated by the recent phenomenological prediction of the universal scaling of
the thermal Hall conductivity, we propose here a simple scaling function for
the Hall coefficient in cuprates that varies exponentially with the
temperature. Comparison with experimental data in La$_{2-x}$Sr$_{x}$CuO$_{4}$,
YBa$_2$Cu$_3$O$_{6+\delta}$, and Bi$_{2}$Sr$_{2-x}$La$_{x}$CuO$_{6+\delta }$
confirms its validity over a wide temperature and doping range. The scaling is
independent of microscopic details and arises as long as the hole carriers have
nonzero Berry curvature density within a finite energy window, possibly due to
their interaction with the spin liquid. This differs from the activation model
proposed previously to explain the Hall coefficient at low doping and high
temperatures, and suggests a unified picture in line with the one parameter
scaling observed in many physical quantities of cuprates.
