Trihex

The trihex is equal to \(\lbrace6,6,6\rbrace\) or \(6\lbrace6\rbrace6\) in BEAF or 6 octated to 6. . The term was coined by Aarex Tiaokhiao. This is the sixth Ackermann number.

Etymology
The name of this number is based on tri- (three) and hexa- (six), meaning that there are 3 6's in the array.