 The knots are sometimes designated by their number alone (e.g., FM2 for the four-in-hand, with "FM" standing for Fink-Mao).A knot is self-releasing if, when the thin end is pulled out through the knot, no knot is left; as all knots start on the left, a knot is self-releasing if the terminal sequence is Ro Li Co; it is "not" self-releasing if the terminal sequence is Lo Ri Co. Symmetry and self-releasing are in complementary distribution for knots with the greatest degree of balance for their class.Three common variant knots are as follows.