figure of eight(n = noun.artifact) figure eight - a knot having the shape of the numeral 8; tied in a rope that has been passed through a hole or pulley and that prevents the rope from coming loose;
is a kind of knot

authority figure, eight, eight ball, father figure, figure, figure eight, figure loom, figure of speech, figure out, figure skate, figure skating, lay figure, mother figure, piece of eight, plane figure, public figure, section eight, significant figure, solid figure, stick figure, terminal figure, three-dimensional figure, two-dimensional figure, wax figure