The number 3 serves as the only number that equals the sum of all preceding numbers (0 + 1 + 2 = 3). Also, when 3 is added to itself, the smallest perfect number ensues (6). And when 3 is squared, the result is the number that completes the single-digit numbers in the decimal system, better known as the number 9 why 369 is universe of key ? Nikola Tesla was obsessed with numbers, but especially 3, 6 and 9. He wanted the world to know the significance of the number 3 6 9, he claimed that these were extremely important numbers, but the question is why? What was that Nikola Tesla wanted the world to understand? How it became Nikola Tesla 3 6 9 theory? To understand that, we must first know about Mathematics. Why it is so different yet the same anywhere in the universe. Maths was and has been the most valued subject of all the time and the most powerful too. Two plus two will always be four everywhere in the universe. Possibly Nikola Tesla knew the power of the numbers 3 ...