What is implied when it is said that the Qur'an is a supernatural sign?

It can be understood from the revealed scriptures that the messengers of God, who were appointed by God Himself, had been given supernatural signs to convince people of the truth of their prophethood. These signs, or miracles, were intended to enable people to appreciate the fact that their claims to prophethood were, indeed, true. The staff given to the Prophet Moosa (a), which he would turn into a serpent, is an example.

These miracles were, however, present and relevent only during their own life times. None of these miracles ever survived after them. Nor were they meant to do so in the future. However, the miracle that manifested itself through the last messenger is certainly not of that kind. Like his mission, it too will survive upto the Last Day. This marvellous  miracle is the Qur'an. The Qur'an may be examined by any  upto the Last Day. The wonders within it may confirm as to whether the prophethood of Muhammad (S.A.W) is, in fact, genuine.

The Qur'an, which constitutes, at one and the same time, a religious scripture and a supernatural sign, is, in itself, the ever lasting miracle of miracles that is to remain till the Last Day.