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  2. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    It is numbered with a stylized flag symbol surrounding the number (or sometimes a delta symbol). A general note applies generally and is not called out with flags. 2. Find number: "FN" meaning "find number" refers to the ordinal number that gives an ID tag to one of the constituents in a parts list (list of materials, bill of materials).

  3. Recession shapes - Wikipedia

    en.wikipedia.org/wiki/Recession_shapes

    Greece, while part of the Eurozone, saw continuous economic contraction from 2007 to 2015, and thus does not fit the definition of a W-shaped recession, but rather an L-shaped recession. The United Kingdom is not a member of the Eurozone, but was a member of the European Union until 2020 ( Brexit ), and suffered a minor W-shaped recession when ...

  4. Gas cylinder - Wikipedia

    en.wikipedia.org/wiki/Gas_cylinder

    For example, a hydrogen cylinder valve outlet does not fit an oxygen regulator and supply line, which could result in catastrophe. Some fittings use a right-hand thread, while others use a left-hand thread; left-hand thread fittings are usually identifiable by notches or grooves cut into them, and are usually used for flammable gases.

  5. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...

  6. Koch's triangle - Wikipedia

    en.wikipedia.org/wiki/Koch's_triangle

    Koch's triangle, also known as the triangle of Koch, is named after the German pathologist Walter Koch. [1] It is an anatomical area located at the base of the right atrium , and its boundaries are the coronary sinus orifice, tendon of Todaro , and the septal leaflet of the right atrioventricular valve (also known as the tricuspid valve). [ 2 ]

  7. List of symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_symbols

    Hazard symbols; List of mathematical constants (typically letters and compound symbols) Glossary of mathematical symbols; List of physical constants (typically letters and compound symbols) List of common physics notations (typically letters used as variable names in equations) Rod of Asclepius / Caduceus as a symbol of medicine

  8. Propane, butane, and LPG container valve connections

    en.wikipedia.org/wiki/Propane,_butane,_and_LPG...

    Several types of valve connections for propane, butane, and LPG containers exist for transport and storage, sometimes with overlapping usage and applications, and there are major differences in usage between different countries. Even within a single country more than one type can be in use for a specific application.

  9. Aeolian-Skinner - Wikipedia

    en.wikipedia.org/wiki/Aeolian-Skinner

    The Skinner & Cole Company was formed in 1902 as a partnership of Ernest Skinner and Cole, another former Hutchings-Votey employee. By 1904 the partnership had dissolved, and the "Ernest M. Skinner & Company" purchased the Skinner and Cole assets, in the form of the contract for the Evangelical Lutheran Church of the Holy Trinity in New York City [1] from the former company for $1.