The crossword solution for the term 'BILLBOARD' is HOT, which is a three-letter word. HOT is an acronym for 'Highly Observed in Trade', and is used to describe popular products or services that are widely recognized and sought after. The term is often used in the context of the music industry, where it is used to refer to songs or albums that are popular on the Billboard charts. Billboard is a weekly American magazine that publishes the most popular songs and albums in the United States.