This design is found in the Book of Kells. The design is reminiscent of two hearts drawn together in the dance of life. It also represents eternity and love because the repetitive motif is a triskele.
Many of these designs are found in the Book of Kells and Lindisfarne as well, both from the golden age of the Celts, circa 650-1100AD.
The matching ring for a set with this design is the Muny Musk Triskele.
This design is named after the first client who ordered this pendant. (With some custom designs, it helps me remember the design better.)
There are 2 sizes available: P140 is 4.3 x 3 cm and P333 is 3.2x 2.1cm.