Up-arrow notation is a notation created in 1976 by Donald Knuth.
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In mathematics, Knuth's up-arrow notation is a method of notation for very large integers, introduced by Donald Knuth in 1976. In his 1947 paper, R. L. Read more on Wikipedia...
2↑4 = 2 ^ 4 = 16
2↑↑4 = 2 ^ (2 ^ 4) = 65536
2↑↑↑4 = 2 ^ (2 ^ (2 ^ 4)) = 2 ^ 65536