The eternal knot, also known as the Celtic knot, is a symbol that represents eternity, the interconnectedness of life, and the continuity of all things: 
 
Appearance: A single chord that interweaves and interlocks to create a closed circuit with no beginning or end 
Meaning: Symbolizes the eternity of life, love, friendships, relationships, and the world 
 
The Celtic knot's symbolic significance is believed to express: The interwoven-ness of life, The boundedlessness of God, and The infinite diversity of God's creation.