The Celtic Sisters Knot is a symbol of sisterhood and the strong, eternal bond we share with our sisters and friends. ... The stylized triquetra or triple spiral, a sister symbol woven within the Celtic Sisters Knot heart symbolizes the three stages of woman. Where are you and your sisters on the spiral of life? Celebrate the powerful, lifelong bond of friendship between women with a symbol for sisters. One day we will all be in some part of all 3 stages of life. First, the youth of our childhood. Second, the mothering spirit of our years. Third, our wisdom that we pass on to the new generation of women. We may not all be related, but we all share a bond of love, compassion, and perseverance. There are few symbols for sisters like the Celtic Sisters Knot that captive the soul and beauty of sisterhood.