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The pijillion is equal to $$10^{3\times 10^{3\times 10^{3\times 10^{3\times 10^{150}}}}+3}$$.[1][2] The term was coined by Nirvana Supermind. The creator later found out that this term is ambigous with Sbiis Saibian's pijillion (which is $$10^{3\times 10^{3\times 10^{15,000,000,000}} + 3}$$), so the name of that number would have to be modified to "piijillion" or another ablaut.

Approximations

Notation Approximation
Arrow notation $$10\uparrow(3\times 10\uparrow(3\times10\uparrow(3\times10\uparrow(3\times 10\uparrow 150) ) )+3)$$ (exact)
Hyper-E notation E150#5

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3-entry series: