particle number concentration

symbol: $C_{\rm{p}}$; unit: $\pu{L-1}$
https://doi.org/10.1351/goldbook.14323
Number of particles per volume of suspending medium.
Source:
PAC, 2011, 83, 2229. (Terminology of polymers and polymerization processes in dispersed systems (IUPAC Recommendations 2011)) on page 2241 [Terms] [Paper]