ℵ
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Translingual
Etymology
Introduced by Georg Cantor, based on the Hebrew letter א, initial letter of אינסוף (infinity).
Symbol
ℵ (English symbol name aleph)
- (set theory) Symbol for the transfinite enumeration of the infinite cardinal numbers in order of magnitude, a function mapping ordinal numbers to infinite cardinals.
Usage notes
Unicode has two code points for the Hebrew letter aleph. For normal Hebrew text, U+05D0 א should be used. U+2135 should be used for the mathematical symbol in Latin-script text because it will share the left-to-right direction of that text.