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Quadrunculus is equal to $$\{ X,100,4 \}\ \&\ 10$$ using the array of operator and BEAF.[1] Its array is intended to have a 100-dimensional hexational hypercube, which has geegol entries. The term was coined by Jonathan Bowers. It is intended to be comparable to Sbiis Saibian's hexacthulhum.

Since BEAF has not been formalised by Bowers at this level, this number is currently ill-defined.

## Approximations

Since it is not defined by now, the following approximation is just an expected value under climbing method (strong bound):

Notation Approximation
Bird's array notation {10,100[1[1¬3]1[1¬3]2]2}
Fast-growing hierarchy $$f_{\varphi(2,0,0)}(100)$$
Hardy hierarchy $$H_{\varphi(2,0,0)}(100)$$