Overview
Bet, Beth, Beh, or Vet is the second letter of the Semitic abjads, including Phoenician bēt 𐤁 , Hebrew bēt ב, Aramaic bēṯ 𐡁, Syriac bēṯ ܒ, and Arabic bāʾ ب. 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.
O1
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).
Origin
The name bet is derived from the West Semitic word for "house" (as in Hebrew bayt בַּיִת), and the shape of the letter derives from a Proto-Sinaitic glyph that may have been based on the Egyptian hieroglyph Pr O1 which depicts a house.
From Wikipedia (CC BY-SA 4.0).