http://mathworld.i2p/Link.html
Like knots, links can be decomposed into basic units known as prime links . The term " link " is also used primarily by physicists to refer to a graph edge . See also Andrews-Curtis Link , Borromean Rings , Brunnian Link , Composite Link , Hopf Link , Knot , Oriented Link , Prime Link , Unlink , Whitehead Link Explore this topic in the MathWorld ...