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2. NATO phonetic alphabet - Wikipedia

   en.wikipedia.org/wiki/NATO_phonetic_alphabet

   The International Radiotelephony Spelling Alphabet or simply Radiotelephony Spelling Alphabet, commonly known as the NATO phonetic alphabet, is the most widely used set of clear-code words for communicating the letters of the Roman alphabet. Technically a radiotelephonic spelling alphabet, it goes by various names, including NATO spelling ...

3. Delta baryon - Wikipedia

   en.wikipedia.org/wiki/Delta_baryon

   Δ−. (ddd), which respectively carry an electric charge of +2 e, +1 e, 0 e, and −1 e . The Δ baryons have a mass of about 1 232 MeV/c2; their third component of isospin and they are required to have an intrinsic spin of 3 2 or higher (half-integer units). Ordinary nucleons (symbol N, meaning either a proton or neutron ), by contrast, have ...

4. Empty delta sign - Wikipedia

   en.wikipedia.org/wiki/Empty_delta_sign

   The empty delta sign is a radiologic sign seen on brain imaging which is associated with cerebral venous sinus thrombosis. It is usually seen on magnetic resonance imaging (MRI) or computed tomography (CT) scans with contrast. It is seen as dural wall enhancement in the absence of intra-sinus enhancement (there is no enhancement in the lumen of ...

5. ∂ - Wikipedia

   en.wikipedia.org/wiki/%E2%88%82

   The character ∂ ( Unicode: U+2202) is a stylized cursive d mainly used as a mathematical symbol, usually to denote a partial derivative such as (read as "the partial derivative of z with respect to x "). [1] [2] It is also used for boundary of a set, the boundary operator in a chain complex, and the conjugate of the Dolbeault operator on ...

6. Levi-Civita symbol - Wikipedia

   en.wikipedia.org/wiki/Levi-Civita_symbol

   The term " n -dimensional Levi-Civita symbol" refers to the fact that the number of indices on the symbol n matches the dimensionality of the vector space in question, which may be Euclidean or non-Euclidean, for example, or Minkowski space. The values of the Levi-Civita symbol are independent of any metric tensor and coordinate system.

7. Delta Wedding - Wikipedia

   en.wikipedia.org/wiki/Delta_Wedding

   Delta Wedding is a 1946 Southern fiction novel by Eudora Welty. Set in 1923, the novel tells of the experiences of the Fairchild family in a domestic drama-filled week leading up to Dabney Fairchild's wedding to the family overseer, Troy Flavin, during an otherwise unexceptional year in the Mississippi Delta .

8. Y-Δ transform - Wikipedia

   en.wikipedia.org/wiki/Y-Δ_transform

   Y-Δ transform. In electrical engineering, the Y-Δ transform, also written wye-delta and also known by many other names, is a mathematical technique to simplify the analysis of an electrical network. The name derives from the shapes of the circuit diagrams, which look respectively like the letter Y and the Greek capital letter Δ.

9. History of Delta Air Lines - Wikipedia

   en.wikipedia.org/wiki/History_of_Delta_Air_Lines

   Delta Air Lines is a major American airline. [1] [2] The company's history began with the world's first aerial crop dusting operation called Huff Daland Dusters Inc., founded in 1925 in Macon, Georgia [3] to combat the boll weevil infestation of cotton crops. [4] C.E. Woolman, general manager and later Delta's first CEO, led a group of ...