The term 'actuarial datum, e.g.' can be summarized as a STATISTIC or data point used in the field of actuarial science. Actuarial science is a discipline that uses mathematics and statistics to assess risk in the insurance and finance industries. The crossword solution for this term is 'STAT, ' which is an abbreviation for the word 'STATISTIC.' A STATISTIC is a numerical value that describes a certain aspect of a population or phenomenon. Statisticians use statistics to analyze data and make predictions about future events.