\alephThe symbol \aleph is used to denote the aleph numbers, which represent the cardinality (size) of infinite sets. Aleph numbers are used in set theory to describe the sizes of infinite sets, with \aleph_0 (aleph-null) being the smallest infinite cardinal number, representing the cardinality of the set of natural numbers.
The smallest infinite cardinal number, representing the cardinality of the set of natural numbers.
\aleph_0The cardinality of the set of countable ordinal numbers, often associated with the cardinality of the real numbers under the continuum hypothesis.
\aleph_1A general representation of aleph numbers, where \alpha is an ordinal number, used to denote larger infinite cardinalities.
\aleph_\alpha