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Shapes of horseshoe as designed for the African reference alphabet, clearly based on a serifed shape of the Latin capital U.. The letter Ʊ (minuscule: ʊ), called horseshoe or sometimes bucket, inverted omega or Latin upsilon, is a letter of the International Phonetic Alphabet used to transcribe a near-close near-back rounded vowel.
Lecotropal, in botany, shaped like a horseshoe (see horseshoe-shaped, above). From Greek λέκος dish + -τροπος turning [5] [6] [7] Lens or Vesica shape (the latter taking its name from the shape of the lentil seed); see also mandorla, almond-shaped; Lune, from the Latin word for the Moon; Maltese Cross curve [8]
Omega (US: / oʊ ˈ m eɪ ɡ ə,-ˈ m ɛ ɡ ə,-ˈ m iː ɡ ə /, UK: / ˈ oʊ m ɪ ɡ ə /; [1] uppercase Ω, lowercase ω; Ancient Greek ὦ, later ὦ μέγα, Modern Greek ωμέγα) is the twenty-fourth and last letter in the Greek alphabet.
The near-close back protruded vowel is typically transcribed in IPA simply as ʊ , and that is the convention used in this article. As there is no dedicated diacritic for protrusion in the IPA, symbol for the near-close back rounded vowel with an old diacritic for labialization, ̫ , can be used as an ad hoc symbol ʊ̫ for the near-close back protruded vowel.
[12] [13] [14] Historically, blacksmiths—a trade long associated with luck and protection—often hung horseshoes upside down as a symbol of their craft. A superstitious blacksmith and apprentice believe that the luck from the horseshoe will flow toward him or her, their tools, and eventually to whatever project they are working on. [15]
The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics. Additionally, the subsequent columns contains an informal explanation, a short example, the Unicode location, the name for use in HTML documents, [1] and the LaTeX symbol.
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Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.