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See also: א, X, and x

U+2135, ℵ

Letterlike Symbols





Introduced by Georg Cantor, based on the Hebrew letter א, initial letter of אינסוף (infinity).



(English symbol name aleph)

  1. (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.

See also