[NegativeK]

Knuth's up-arrow notation is one of a few ways to address the addition->multiplication->exponentiation->tetration->... extensions: https://en.wikipedia.org/wiki/Knuth%27s_up-arrow_notation

As for practicalities, the mathematician in me will let the scientists deal with that.

[dack]

I like the description of graham's number (by graham) using the up-arrow notation https://youtu.be/GuigptwlVHo?t=31