tetration
The fourth level of math. One is addition, two is multiplication, three is exponentiation and four is tetration.
An example of tetration is if you do 2 tetrated to three, you are doing 2 to the power of 2 three times.
Tetration
tetration is a number who has several exponentions like 5^5^5^5^5, or 5^^5. 5^^5 or 5↑↑5 is a tetration.
Tetration comes after exponentiation.