String theory is a scientific attempt to explain a spiritual anomaly. Anything that binds suggests a direct relationship with our inner self. This is traditionally seen as the Silver Cord that holds the spiritual and physical together. In a psychological sense, string like rope can be seen as a link between two objects or aspects of our lives. We may not have made the connection before in waking life. String appearing in dreams signifies some sort of binding, perhaps to make something secure. It may also represent trying to hold a situation together. You might also like to consult the entries for Hold and Rope.