Aleph

Aleph is the first letter of the Hebrew alphabet.

Modern uses

In mathematics, Georg Cantor decided to use alephs to determine the cardinality of infinite sets. These are called aleph numbers, with some of the most notable ones being aleph null ([math]\displaystyle{ \aleph_0 }[/math]) and aleph one ([math]\displaystyle{ \aleph_1 }[/math]).^[1]

Aleph ("a" pronounced as "father") has a mute sound and is represented by the symbol "א".^[2]

Edit of the public domain work, "Proto-Canaanite_alphabet_reconstructed_23_glyphs.png" by Wikinger
Phoenician letter aleph
Early Aramaic character - Alaph
Aleph
Lapidary Aramaic form of aleph, Southeast Arabia, after D.T. Potts, The Pre-Islamic Coinage of Eastern Arabia, Museum Tusculanum Press (1991), p. 80.
Syriac letter 'Alāp in Eastern form. Created in Inkscape using the East Syriac Adiabene font.
Syriac letter 'Alāp in Serṭā form. Created in Inkscape using the Serto Batnan font.
Syriac letter 'Alāp in Estrangelā form. Created in Inkscape using the Estrangelo Nisibin font.
Syriac letter shapes Alaph