What is another word for costal cartilage?
Pronunciation: [kˈɒstə͡l kˈɑːtɪlɪd͡ʒ] (IPA) 
The costal cartilage is a group of hyaline cartilage that connects the ribs to the sternum and provides flexibility to the chest wall. There are a few synonyms for this term, including rib cartilage, costochondral junction, and chondrosternal joint. The term rib cartilage is used because it is a cartilaginous structure that is associated with the ribs, whereas costochondral junction refers to the place where the costal cartilage meets the rib bone. Chondrosternal joint is another synonym because it describes the joint that connects the cartilage to the sternum, which is made up of hyaline cartilage. Regardless of which term you use, they all refer to the same crucial structural component of the chest.
