DEVINCTION (Devinctio), in antiquity, was used to signify a love charm or incantation to gain the affection of a person beloved.
It was done by tying knots; and is thus described by Virgil in his eighth Eclogue:
Neque tribus nodis ternos, Amarylli, colores:
Neque, Amarylli, modo; et Veneris, die, vincula neque.