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The zettootetrom is equal to $$f_{\omega\uparrow\uparrow10^{21}}(10)$$ using the fast-growing hierarchy.[1] The term was coined by wiki user Denis Maksudov.

## Etymology Edit

The 3 parts of the name, "zetto", "tetr" and "om", mean $$10^{21}$$, tetration and $$\omega$$ respectively, which form $$\omega\uparrow\uparrow10^{21}$$ when concatenated backwards. So the full name indicates the ordinal index of the number.

## Approximations in other notations Edit

Notation Approximation
BEAF $$X \uparrow\uparrow (10^{21}-1)\ \&\ 10$$
Bird's array notation $$\{10,\{10,21\}[1 \backslash 2] 2\}$$
Extended Cascading-E Notation $$E10\#\text{^^}\#(10^{21})$$
Hardy hierarchy $$H_{\omega \uparrow \uparrow 10^{21}}(10)$$
Slow-growing hierarchy $$g_{\vartheta(\Omega \uparrow \uparrow 10^{21})}(10)$$

## Sources Edit

1. My system of number names (FGS) - Traveling To The Infinity
Numbers by Denis Maksudov
Alpha series
Epsilon series
Epsilon(0)-multiplication series: Bultep · Trultep · Quadrultep · Quintultep · Sextultep · Septultep · Octultep · Nonultep · Dekultep · Hektultep · Kilultep · Megultep · Gigultep · Terultep · Petultep · Exultep · Zettultep · Yottultep
Epsilon(0)-exponentiation series: Bexep · Trexep · Quadrexep · Quintexep · Sextexep · Septexep · Octexep · Nonexep · Dekexep · Hektexep · Kilexep · Megexep · Gigexep · Terexep · Petexep · Exexep · Zettexep · Yottexep
Epsilon(0)-tetration series: Bitetrep · Tritetrep · Quadritetrep · Quintitetrep · Sextitetrep · Septitetrep · Octitetrep · Nonitetrep · Dekotetrep · Hektotetrep · Kilotetrep · Megotetrep · Gigotetrep · Terotetrep · Petotetrep · Exotetrep · Zettotetrep · Yottotetrep
$$I_\alpha$$ series
$$I(\alpha,\beta)$$ series
Initial $$I(\alpha,\beta)$$ series: Unimah · Bimah · Trimah · Quadrimah · Quintimah · Sextimah · Septimah · Octimah · Nonimah · Dekimah · Hektimah · Kilimah · Megimah · Gigimah · Terimah · Petimah · Eximah · Zettimah · Yottimah
Inserted $$I(\alpha,\beta)$$ series: Uninimah · Binimah · Trinimah · Quadrinimah · Quintinimah · Sextinimah · Septinimah · Octinimah · Noninimah · Dekinimah · Hektinimah · Kilinimah · Meginimah · Giginimah · Terinimah · Petinimah · Exinimah · Zettinimah · Yottinimah