A brief glossary and description of some terms is provided below. Further detail can be found from a paper by the Casualty Actuarial Society here

**ELT**: a table with event details from the RMS catastrophe model.**YLT**: a table with event losses by year and event**OEP**: probability of a loss of a given size or larger in a year**AEP**: probability of total losses in a year of a given size or larger.**Primary Uncertainty**: whether an event happens or not**Secondary Uncertainty**: given an event happens the uncertainty in the size of the loss