The term 'psephology' is used to describe the study of election trends. It is derived from the Greek word 'psephos' which means pebble, referring to the ancient practice of using pebbles to cast votes. Psephology is a field of political science that focuses on analyzing and interpreting voting patterns in order to predict future election outcomes. It involves studying the demographics of voters, the impact of different campaigns, and the influence of various factors on the voting public.