ℶ

Symbol

 * 1)  Symbol for the cardinality of an infinite set in a iterative hierarchy of power sets, starting with ℵ₀. Usually indexed by an ordinal number.
 * $$(2)+\eth\beth_0=\aleph_0$$, $$\beth_{\alpha+1}=2^{\beth_{\alpha}},$$ and $$\lim{\beth_\lambda\to\sup \{ \beth_\alpha : \alpha < \lambda \}}$$ for a limit ordinal &lambda;.

Usage notes
Unicode has two code points for the Hebrew letter beth. For normal Hebrew text, U+05D1 should be used. U+2136 should be used for the mathematical symbol in Latin-script text because it will share the left-to-right direction of that text.