# ℶ

 ℶ U+2136, ℶ (LaTeX: \beth) BET SYMBOL

## Translingual

### Symbol

(English symbol name beth)

1. (set theory) Symbol for the cardinality of an infinite set in a iterative hierarchy of power sets, starting with ℵ₀. Usually indexed by an ordinal number.
${\displaystyle \beth _{0}=\aleph _{0}}$, ${\displaystyle \beth _{\alpha +1}=2^{\beth _{\alpha }},}$ and ${\displaystyle \beth _{\lambda }=\sup\{\beth _{\alpha }:\alpha <\lambda \}}$ for a limit ordinal λ.