Sets and relations are taught in modern algebra. One of them, character encoding, is used in computers today.
In computing, data storage, and data transmission, character encoding is used to represent a repertoire of characters by some kind of encoding system that assigns a number to each character for digital representation.
We can represents one set of characters instead of another. This was known recently, however this was portrayed in the Quran 1400 years before it was discovered. Some verses in the Quran contain letters that have no meaning in Arabic however they seem to be encoded. In chapter 27 it starts with "T ط" and "S س":
"T ط" occurs 27 times in this chapter, same number of the chapter 27.
"S س" occurs 93 times in this chapter, same number of verses 93.
From Quran Characters Counter:
In chapter 27, "T ط" occurs 27 times and "S س" occurs 93 times.
This chapter is number 27, but the Quran was arranged after the prophets' death so he couldn't have known that this chapter will be number 27; and yet number 27 is encoded in the letters.
If "T ط" is 27 and "S س" is 93 then Quran T:S says that you will see God's signs and you will recognize them:
And say, “Praise belongs to Allah; He will show you His signs, and you will recognize them. Your Lord is not heedless of what you do.”
٩٣ وَقُلِ الْحَمْدُ لِلَّهِ سَيُرِيكُمْ آيَاتِهِ فَتَعْرِفُونَهَا ۚ وَمَا رَبُّكَ بِغَافِلٍ عَمَّا تَعْمَلُونَنَ
"He will show you His signs, and you will recognize them" this verse is talking about signs that we will discover. Today we discovered that the chapter and verse numbers are encoded.
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