The term 'Jolly Roger Feature' refers to the iconic symbols of a pirate flag, which typically consists of a SKULL and crossbones, sometimes accompanied by two crossed BONES. The crossword solutions for this term are 'BONES' (5 letters), 'BONE' (4 letters), and 'SKULL' (5 letters). All three words refer to the skeletal remains of a human or animal, which are often used to represent death and danger in popular culture. The SKULL and crossbones is a particularly popular symbol of piracy, and is often referred to as the 'Jolly Roger'.