Other name: interlacing. Reference: Dale Rolfsen, Knots and Links (1976).

A link is a finite set of interlaced knots. More precisely, it is an equivalence class of finite sets of closed curves of  without double points nor common points, two sets of curves being equivalent if each curve of one set can be continuously transformed in  into a curve of the other set, the curve remaining closed and without double points nor common points with any other curve along the transformation.

The crossing number of a link is the minimal number of double points in the planar projections (without points of order greater than or equal to 3) of its representatives. A link a representative of which has a projection without crossings is said to be trivial.

Here is the Rolfsen table of the first prime links, with two or more blades (the symbol  gives the crossing number N, the number of blades n, and the order number p among the links with N crossings):

The first six are Pretzel links.
More complete table in the knot atlas.

Examples, with the notation N.n.p (N = crossing number, n = number of blades, p = order number given by Rolfsen):

See also the Carrick bend, Brunnian links, that become trivial when we get rid of one of the components, billiard links, the Turk's heads, Pretzel links, linear celtic knots, the link of the icosidodecahedron, the Seifert surfaces, that fill a link, Antoine's necklace, that is the limit of a sequence of links.

 Notice that the weave on the left is in fact a trivial link. By the way, it is the reason why it can be made with crepe paper without tearing it!

 This cube strapping forms an link of 6 loops end 24 crossings that is linked to the rhombicuboctahedron. On the right, two flat versions of the same link; notice the symmetry of order  4 for one, and 3 for the other one.