entropy of activation, Math - title

https://dx.doi.org/10.1351/goldbook.E02150
The entropy change that appears in the thermodynamic form of the rate equation obtained from conventional transition-state theory.
Source:
PAC, 1996, 68, 149 (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 165
PAC, 1994, 66, 1077 (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1113