Final answer:
The Christian symbol that represents the eternal nature of Jesus is the Mandorla. It signifies his divinity and everlasting nature, a concept that is essential to Christian theology and is vividly portrayed through art and symbolism.
Step-by-step explanation:
The Christian symbol that represents the eternal nature of Jesus is often depicted by the imagery of Christ surrounded by a Mandorla, which is a halo around the body of a sacred person. This symbolism signifies the divine and eternal aspect of Jesus Christ, especially as he will be seen at the end of time, according to the descriptions found in the Book of Revelation. Moreover, the use of the cruciform halo in Christian art also points to the eternal nature of Jesus by linking him to the concept of the Trinity, which comprises God the Father, the Holy Spirit, and Jesus Christ Himself. These elements evoke the idea of Jesus' everlasting divinity and his role in eternal life for believers, which is central to Christian theology.