# aleph number

> alef symbol (U+2135) or aleph, written left-to-right as the mathemical symbol ‹ℵ› for the first transfinite cardinal (countable); ordered sequence of transfinite numbers used to represent the cardinality (or size) of infinite countable sets

**Wikidata**: [Q908627](https://www.wikidata.org/wiki/Q908627)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Aleph_number)  
**Source**: https://4ort.xyz/entity/aleph-number


## References

1. Freebase Data Dumps. 2013
2. [Source](https://html.spec.whatwg.org/multipage/named-characters.html)
3. [Source](https://html.spec.whatwg.org/multipage/syntax.html#character-references)
4. [Source](https://www.unicode.org/Public/UCD/latest/ucd/NamesList.txt)