Definition and Context
In biblical literature, "Great Signs" refer to extraordinary events or phenomena that serve as divine indicators or manifestations of God's power and presence. These signs often accompany pivotal moments in biblical history, serving as both warnings and affirmations of God's will. They are typically supernatural in nature, transcending natural laws and human understanding.

Old Testament References
The Old Testament is replete with instances of great signs. One of the earliest examples is found in the narrative of the Exodus. God performed numerous signs and wonders in Egypt to compel Pharaoh to release the Israelites. These included the ten plagues, which culminated in the Passover event (Exodus 7-12). In Deuteronomy 6:22, Moses reminds the Israelites, "Before our eyes the LORD sent signs and wonders—great and terrible—on Egypt and Pharaoh and his whole household."

Another significant instance is the sign of the sun standing still during the battle of Gibeon, as recorded in Joshua 10:12-14. This miraculous event demonstrated God's intervention on behalf of Israel, allowing them to achieve victory over their enemies.

Prophetic Literature
The prophets frequently spoke of great signs as indicators of God's impending judgment or deliverance. In Joel 2:30-31, the prophet declares, "I will show wonders in the heavens and on the earth, blood and fire and columns of smoke. The sun will be turned to darkness and the moon to blood before the coming of the great and awesome day of the LORD." These signs are often associated with the "Day of the Lord," a time of divine intervention in human history.

New Testament References
In the New Testament, great signs continue to play a crucial role, particularly in the ministry of Jesus Christ and the early church. Jesus performed numerous signs and miracles, which the Gospel of John refers to as "signs" that reveal His divine identity and authority. In John 2:11, after turning water into wine at Cana, it is noted, "This, the first of His signs, Jesus did at Cana in Galilee, and thus revealed His glory. And His disciples believed in Him."

The Book of Acts records the apostles performing great signs and wonders as evidence of the Holy Spirit's power and the truth of the Gospel message. Acts 2:43 states, "A sense of awe came over everyone, and the apostles performed many wonders and signs."

Eschatological Significance
Great signs are also prominent in eschatological passages, particularly in the Book of Revelation. These signs are often symbolic, representing the cosmic struggle between good and evil. Revelation 12:1 describes a "great sign" appearing in heaven: "a woman clothed with the sun, with the moon under her feet, and a crown of twelve stars on her head." Such imagery conveys profound theological truths about God's ultimate victory and the establishment of His kingdom.

Theological Implications
From a theological perspective, great signs serve multiple purposes. They authenticate the message and messengers of God, provide assurance to believers, and act as warnings to those who oppose God's will. They underscore the sovereignty of God over creation and history, affirming that He is actively involved in the world and guiding it toward His redemptive purposes.

Conclusion
While the Bible does not provide an exhaustive list of great signs, the ones recorded serve as powerful reminders of God's omnipotence and His ongoing relationship with humanity. They call believers to faith, repentance, and readiness for the fulfillment of God's promises.