The Trinity Knot with Circle, also known as a circled triquetra, is a variation of the traditional three-pointed Celtic knot enclosed or intertwined with a continuous ring. The three interlocking arcs are commonly associated with ideas of unity, eternity, and interconnectedness, while the circle reinforces themes of wholeness, continuity, and the infinite.

In tattooing, the symbol is often chosen for its balance of simplicity and layered meaning. Depending on the wearer, it may represent the bond between three people, the connection of mind, body, and spirit, the Christian Holy Trinity, or a broader sense of enduring unity. Its strong geometric structure also makes it well suited to minimalist, blackwork, ornamental, and Celtic-inspired tattoo designs.