Aleph

n. alef, first letter of the Hebrew alphabet

is the reconstructed name of the first letter of the Proto-Canaanite alphabet, continued in descended Semitic alphabets as Phoenician  ,  Syriac  , Hebrew Aleph , and Arabic  .Aleph originally represented the glottal stop (IPA ), usually transliterated as , a symbol based on the Greek spiritus lenis , for example in the transliteration of the letter name itself, .The Phoenician letter gave rise to the Greek Alpha (Α), being re-interpreted to express not the glottal consonant but the accompanying vowel, and hence the Latin A and Cyrillic А.
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Aleph or Alef is the first letter of the Semitic abjads descended from Proto-Canaanite (Phoenician alphabet, Hebrew alphabet,  Syriac alphabet). Named after the letter: In philology:Aleph, a shorthand designation for Codex Sinaiticus, a 4th-century manuscript of the BibleIn science:Aleph number or cardinality, a measurement of mathematical setsaleph null (), the cardinality of countable infinite setsaleph one (), the cardinality of certain uncountably infinite sets (if the continuum hypothesis is true, then the set of all real numbers has this cardinality).Aleph (inductive logic programming), an advanced system for inductive logic programmingALEPH (Apparatus for LEP Physics at CERN), ALEPH detector or ALEPH experiment, one of the four detectors of the Large Electron-Positron Collider (LEP) at CERNAlef programming language, the concurrent programming language used in early editions of Plan 9Aleph kernel was an operating system kernel, notable primarily for being one of the steps in the evolution of the Mach kernelAleph, an integrated library system from Ex Libris LTD used to manage library operations
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Noun
1. the 1st letter of the Hebrew alphabet
(hypernym) letter, letter of the alphabet, alphabetic character
(member-holonym) Hebrew alphabet, Hebraic alphabet, Hebrew script

n. alef, first letter of the Hebrew alphabet

Aleph 'aleph (Hebrew) The first letter in the Hebrew alphabet (Hebrew char), having the ox or bull for its symbol; also having the numerical value of 1. In its composition it is said by Qabbalists to symbolize waw (Hebrew char) between yod (Hebrew char) and daleth (Hebrew char), thus the letter itself represents the word yod (which again is the perfect number 10).