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It's called a linklink. From Wikipedia,

A chain is a series of connected linkslinks which are typically made of metal. A chain may consist of two or more linkslinks.

It's called a link. From Wikipedia,

A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links.

It's called a link. From Wikipedia,

A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links.

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It's called a link. From Wikipedia,

A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links.