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The tetrakulus is equal to $$4\&4\&4\&4 = \{ 4,4 /2 \}$$ using the array of operator and BEAF.[1] It has possible interpretation of tetrakulus entries. The term was coined by Cookie Fonster. The number is derived from triakulus and the Greek word "tetra" for four.

## Approximations in other notations

Notation Approximation
Bird's array notation $$\{4,4 [1 [1 [2 \neg 3 \text{♦} 2] 2] 2] 2\}$$

## Sources

1. Pointless Gigantic List of Numbers - Part 6: The Mighty RoyalsPointless Large Number Stuff. Retrieved 2017-05-21.