The triennet (also called trienn) is equal to \(\lbrace9,9,9\rbrace\) or \(9\lbrace9\rbrace9\) in BEAF or 9 undecated to 9.. The term was coined by Aarex Tiaokhiao. This is the ninth Ackermann number.
The name of this number is based on Greek prefixes tri- (three) and ennea- (nine), meaning that there are 3 9's in the array.
- ↑ Pointless Gigantic List of Numbers - Part 3. Retrieved February 16, 2015.
- ↑ Tiaokhiao, Aarex. Aarex's Array Notation. Retrieved December 2013.