User blog comment:Googleaarex/My number is bigger! (Googology Wiki version)/@comment-5029411-20140920183517/@comment-5029411-20140920232022

(5^5^5)^^5

Arrow function:

Arrow(n,m,0) = $$n * m$$

Arrow(n,m,1) = $$n \uparrow m$$

Arrow(n,m,2) = $$n \uparrow\downarrow m$$

Arrow(n,m,3) = $$n \uparrow\uparrow m$$

Arrow(n,m,4) = $$n \uparrow\downarrow\downarrow m$$

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