The Myriofact (coined by SuperJedi224) is equal to 10,000* using SpongeTechX's Mixed Factorial.

Source: [1]

Notation Approximation
Up-arrow notation 10,000\uparrow^{9,999}10,000
BEAF \{10000,10000,9999\}
Hyper-E notation E4\#\#1\#2
Chained arrow notation 10000\rightarrow10000\rightarrow9999
Hyperfactorial array notation 9,998![1]
X-Sequence Hyper-Exponential Notation 10000\{X+1\}2
Fast-growing hierarchy f_{\omega}(9,999)
Hardy hierarchy H_{\omega^{\omega}}(9,999)
Slow-growing hierarchy g_{\varphi(\omega,0)}(9,998)
Numbers By SuperJedi224

Fibonacci Numbers

Pound-Star Notation