Little birdie

is equal to \(\{100,100[1[1\backslash1\backslash2\neg2]2]2\}\) in Bird's array notation, using the modified Hierarchical Hyper-Nested Array Notation. The term was coined by googology user .
==Approximations==
Notation 	Approximation
Collapsing-E Notation 	\(\text{E}100\#\{\&\text{^}\&\}\#100\)
DeepLineMadom's Array Notation 	\(100[1\{1<1/1/2>2\}2\}2]100\)
Fast-growing hierarchy ((with this system of fundamental sequences)	\(f_{\psi_0(\Omega^{\Omega^{\Omega}})}(100)\)
Hardy hierarchy (with this system of fundamental sequences) 	\(H_{\psi_0(\Omega^{\Omega^{\Omega}})}(100)\)
Slow-growing hierarchy (with this system of fundamental sequences) 	\(g_{\psi_0(\Omega_2^{\Omega_2^{\Omega_2}})}(100)\)
==Sources==
Category:Numbers
Category:Numbers by HaydenTheGoogologist2009
Category:Bachmann's collapsing level
Category:Bird's array notation numbers
Category:Irregular names