This refers to the shiny white cap at the end of articulating bones (bones forming joints). The common term would be 'gristle', like the gristle at the end of a chicken bone.
(AKA joint cartilage)
Joint cartilage is also called 'hyaline cartilage' or 'articular cartilage'.
See articular cartilage.
A different variety of cartilage occurs in the meniscus, and in the windpipe.
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