# ℵ

Character ℵ ALEF SYMBOL U+2135 Letterlike Symbols `\aleph`

## Translingual

### Etymology

Introduced by Georg Cantor, based on the Hebrew letter א.

### Symbol

1. (set theory) Symbol for the cardinality of a well-orderable infinite set.

### Usage notes

• Unicode has two code points for the Hebrew letter aleph. For Hebrew text, א, should be used . This character should be used for the mathematical symbol since it retains the left-to-right orientation of the text.