cell constant 

of a conductivity cell
https://doi.org/10.1351/goldbook.C00918
Defined as: κcell=κ R where R is the measured resistance of the cell and κ is the conductivity (formerly called the specific conductance).
Source:
PAC, 1974, 37, 499. (Electrochemical nomenclature) on page 511 [Terms] [Paper]