Our Sisters Knot Celtic heart is a symbol of sisterhood and the strong, eternal bond we share with our sisters and friends. The intricate Celtic knot heart is an unbroken line symbolic of an everlasting love. The stylized triquetra or triple spiral, woven within the Celtic knot heart symbolizes the three stages of woman. The three stages of woman are maid, mother and wise woman. Where are you and your sisters on the spiral of life? Celebrate the powerful, life long bond of friendship between women with our Sisters Knot necklace.