A CFL player is a PROFESSIONAL athlete who plays in the Canadian Football League. The acronym 'CFL' stands for Canadian Football League, and a player in this league is typically a highly skilled and experienced football player. The three-letter acronym 'PRO' is an abbreviation for the word 'PROFESSIONAL, ' which is used to describe someone who is highly trained and experienced in their field. Therefore, a CFL player is a PROFESSIONAL athlete who plays in the Canadian Football League.