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Ennadecal is equal to {10,10,10,10,10,10,10,10,10} in BEAF[1] or 9 & 10, using the array of operator. The term was coined by Jonathan Bowers.

Ennadecal is comparable to $$f_{\omega^7}(10)$$ in the fast-growing hierarchy.

## Etymology

The name of this number is based on the words "enna-" (Greek for nine) and "decal-" (Greek for ten), meaning that there are 9 10's in the array.

## Approximations

Notation Approximation
Extended Hyper-E notation E10########11
Fast-growing hierarchy $$f_{\omega^7}(10)$$
Hardy hierarchy $$H_{\omega^{\omega^7}}(10)$$

## Sources

1. Bowers, JonathanInfinity Scrapers. Retrieved January 2013.

Tritri series: tritri · tritet · tripent · trisept · tridecal · grand tridecal
Tetratri series: tetratri · supertet · general(plex)
Pentatri series: pentatri · superpent · pentadecal(plex)
Hexatri series: hexatri · superhex · hexadecal(plex)
Heptatri series: heptatri · supersept · heptadecal
Iteral series: superoct · octadecal · superenn · ennadecal · iteral · ultatri
Dupertri series: dupertri · duperdecal · truperdecal · quadruperdecal
Latri series: latri · emperal(plex) · hyperal(plex) · admiral
Dutritri series: dutritri · dutridecal
Dimentri series: dimentri · dulatri · trilatri · trimentri
Triakulus series: triakulus · tridecatrix
Big boowa series: big boowa · great big boowa · grand boowa
Tiaokhiao's extensions: trihex · trioct · triennet · triundecal · tridodecal · tritriplex · tritriplexian · grand tritri · tetrapent · tetrahex · grand tetratri · octatri · enneatri · decatri · undecatri · dodecatri