An aleph number is any of a sequence of numbers used to represent the cardinality of infinite sets, denoted by the Hebrew letter aleph.

Sets are classified according to their cardinality: a measure of the number of elements that it contains.

The cardinality of a set may be finite, aleph-null or aleph-one.

Aleph-null is the number of integers (or rational numbers).

Aleph-one

The number of rationals is Aleph-null.

An aleph-one is the second of the transfinite cardinal numbers, which, according to the continuum hypothesis, corresponds to the number of real numbers.

Aleph Zadik Aleph was created in 1924-05.