Bet, Beth, Beh, or Vet is the second letter of the Semitic abjads, including Arabic bāʾ ب‎, Aramaic bēṯ 𐡁, Hebrew bēt ב‎, Phoenician bēt 𐤁, and Syriac bēṯ ܒ. Its sound value is the voiced bilabial stop ⟨b⟩ or the voiced labiodental fricative ⟨v⟩.

The letter's name means "house" in various Semitic languages (Arabic bayt, Akkadian bītu, bētu, Hebrew: bayīṯ, Phoenician bēt etc.; ultimately all from Proto-Semitic *bayt-), and appears to derive from an Egyptian hieroglyph of a house by acrophony.

The Phoenician letter gave rise to, among others, the Greek beta (Β, β), Latin B (B, b) and Cyrillic Be (Б, б) and Ve (В, в).

The name bet is derived from the West Semitic word for "house" (as in Hebrew: בַּיִת, romanized: bayt), and the shape of the letter derives from a Proto-Sinaitic glyph that may have been based on the Egyptian hieroglyph Pr

, which depicts a house.^{[citation needed]}

Hieroglyph	Proto-Sinaitic	Phoenician	Paleo-Hebrew

The Arabic letter ب is named بَاءْ bāʾ (bāʔ). It is written in several ways depending on its position in the word

^{[citation needed]}

The letter normally renders /b/ sound, except in some names and loanwords where it can also render /p/, often Arabized as /b/, as in بَرْسِيلْ (Persil). For /p/, it may be used interchangeably with the Persian letter پ - pe (with 3 dots) in this case.^{[citation needed]}

Bāʾ is the first letter of the Quran ^{[ 1:1]}, the first letter of Basmala.^[1] The letter bāʾ as a prefix may function as a preposition meaning "by" or "with". Some tafsirs interpreted the positioning of bāʾ as the opener of the Qur'an with "by My (God's) cause (all is present and happen)".^[2]

A variant letter of bāʾ named pe is used in Persian with three dots below instead of just one dot below. However, it is not included on one of the 28 letters on the Arabic alphabet. It is thus written as:

^{[citation needed]}

Orthographic variants
Various print fonts			Cursive Hebrew	Rashi script
Serif	Sans-serif	Monospaced
ב	ב	ב

Hebrew spelling: בֵּית‎

The Hebrew letter represents two different phonemes: a "b" sound (/b/) (bet) and a "v" sound (/v/) (vet). When Hebrew is written Ktiv menuqad (with niqqud diacritics) the two are distinguished by a dot (called a dagesh) in the centre of the letter for /b/ and no dot for /v/. In modern Hebrew, the more commonly used Ktiv hasar niqqud spelling, which does not use diacritics, does not visually distinguish between the two phonemes.^{[citation needed]}

This letter is named bet and vet, following the modern Israeli Hebrew pronunciation, bet and vet (/bet/), in Israel and by most Jews familiar with Hebrew, although some non-Israeli Ashkenazi speakers pronounce it beis (or bais)^[3] and veis (/bejs/) (or vais or vaiz).^[4] It is also named beth, following the Tiberian Hebrew pronunciation, in academic circles.^{[citation needed]}

In modern Hebrew the frequency of the usage of bet, out of all the letters, is 4.98%.^{[citation needed]}

When the Bet appears as בּ‎ with a "dot" in its center, known as a dagesh, then it represents /b/. There are various rules in Hebrew grammar that stipulate when and why a dagesh is used.^{[citation needed]}

In Ktiv menuqad spelling, which uses diacritics, when the letter appears as ב‎ without the dagesh ("dot") in its center it represents a voiced labiodental fricative: /v/. In Ktiv hasar niqqud spelling, without diacritics, the letter without the dot may represent either phoneme.^{[citation needed]}

As a prefix, i.e. when attached to the beginning of a word, the letter bet may function as a preposition meaning "in", "at", or "with".^{[citation needed]}

As a numeral, the letter represents the number 2, and, using various systems of dashes above or below, can stand for 2,000 and 20,000.^{[citation needed]}

Bet in gematria represents the number 2.^{[citation needed]}

Bet is the first letter of the Torah. As Bet is the number 2 in gematria, this is said to symbolize that there are two parts to Torah: the Written Torah and the Oral Torah. According to Jewish legend, the letter Bet was specially chosen among the 22 letters in Hebrew by God as the first letter of Torah as it begins with "Bereshit (In the beginning) God created heaven and earth."^[5]

Genesis Rabbah points out that the letter is closed on three sides and open on one; this is indicate that one can investigate what happened after creation, but not what happened before it, or what is above the heavens or below the earth.^[6]

Beth
Madnḫaya Beth
Serṭo Beth
Esṭrangela Beth

In the Syriac alphabet, the second letter is ܒ — Beth (ܒܹܝܬ). It is one of six letters that represents two associated sounds (the others are Gimel, Dalet, Kaph, Pe and Taw). When Beth has a hard pronunciation (qûššāyâ) it is a [b]. When Beth has a soft pronunciation (rûkkāḵâ) it is traditionally pronounced as a [v], similar to its Hebrew form. However, in eastern dialects, the soft Beth is more often pronounced as a [w], and can form diphthongs with its preceding vowel. Whether Beth should be pronounced as a hard or soft sound is generally determined by its context within a word. However, wherever it is traditionally geminate within a word, even in dialects that no longer distinguish double consonants, it is hard. In the West Syriac dialect, some speakers always pronounce Beth with its hard sound.^{[citation needed]}

In set theory, the beth numbers stand for powers of infinite sets.^{[citation needed]}

• Bayt/Beit/Beth/Bet (disambiguation), meaning 'house' in various Semitic languages; part of many place-names