The Darcy number is a dimensionless quantity used to measure fluid flow in porous media. Other terms that can be used to describe this concept include the Reynolds number, the permeability number, or the flow coefficient. The Reynolds number is specifically related to the turbulence of fluid flow, while the permeability number reflects the conductivity of the porous medium. The flow coefficient can refer to the rate of flow through a pipe or channel. These synonyms may be useful for scientists and engineers working with fluid dynamics, particularly in the areas of oil and gas exploration, groundwater management, and hydraulic engineering.