standard amount concentration

symbol: $c^{_{^⦵\!}}$
synonym: standard concentration
https://doi.org/10.1351/goldbook.15363
Chosen value of amount concentration.
Note: In principle, one may choose any value for the standard concentration, although the choice must be specified. The most common choice for standard concentration is \(c^{_{^⦵\!}} = \pu{1 mol dm-3}\), which is universally accepted.
Source:
PAC, 2008, 80, 233. (Glossary of terms related to solubility (IUPAC Recommendations 2008)) on page 267 [Terms] [Paper]