Triundecal

The triundecal is equal to \(\lbrace11,11,11\rbrace\) or \(11\lbrace11\rbrace11\) in BEAF or 11 tredecated to 11. . The term was coined by Aarex Tiaokhiao. This is the eleventh Ackermann number.

Etymology
The name of this number is based on tri- (three) and undecal- (eleven), meaning that there are 3 11's in the array.