The term 'Thorax Protector' refers to a type of protective gear worn by workers in hazardous environments. It is made up of a RIB guard, which is a three-letter word, RIBS. The RIB guard is designed to protect the wearer's chest and torso from potential injury. It is typically made of a strong material such as Kevlar or steel and is designed to absorb impact and provide additional protection. The RIB guard is often worn in combination with other protective gear such as helmets and gloves.