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  2. Engineering drawing abbreviations and symbols - Wikipedia

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

    f: finish: An italic f (Latin small letter f) written on a line representing a surface was an old way of indicating that the surface was to be machined rather than left in the as-cast or as-forged state. The "f" came from "finish" in the sense of "machine finish" as opposed to raw stock/casting/forging.

  3. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.

  4. List of proofreader's marks - Wikipedia

    en.wikipedia.org/wiki/List_of_proofreader's_marks

    s/b: should be: Selection should be whatever edit follows this mark s/r: substitute/replace: Make the substitution tr: transpose: Transpose the two words selected vf: verb form (Mostly used when translating) The version of the verb is used incorrectly e: ending: The ending of the word is incorrect / needs to be changed c: capitalization

  5. Check valve - Wikipedia

    en.wikipedia.org/wiki/Check_valve

    A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...

  6. Control-flow diagram - Wikipedia

    en.wikipedia.org/wiki/Control-flow_diagram

    Example of a "performance seeking" control-flow diagram. [1] A control-flow diagram (CFD) is a diagram to describe the control flow of a business process, process or review. Control-flow diagrams were developed in the 1950s, and are widely used in multiple engineering disciplines.

  7. Automotive acronyms and abbreviations - Wikipedia

    en.wikipedia.org/wiki/Automotive_acronyms_and...

    R-134a: Refrigerant 134a, tetrafluoroethane (C 2 H 2 F 4) R-152a: Refrigerant 152a, difluoroethane (C 2 H 4 F 2) RCTA: Rear Cross Traffic Alert; RPE: Retail price equivalent; RWD: Rear Wheel Drive; SULEV: Super ultra low emission vehicle; SUV: Sport utility vehicle; TBI: Throttle body injection; TCS: Traction control system; TRR: Tire rolling ...

  8. Temperature–entropy diagram - Wikipedia

    en.wikipedia.org/wiki/Temperature–entropy_diagram

    In thermodynamics, a temperature–entropy (Ts) diagram is a thermodynamic diagram used to visualize changes to temperature (T ) and specific entropy (s) during a thermodynamic process or cycle as the graph of a curve. It is a useful and common tool, particularly because it helps to visualize the heat transfer during a process.

  9. Glossary of Unified Modeling Language terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_Unified...

    It is often indicated by a thin box or bar superimposed on the Object's lifeline in a Sequence Diagram; Activity diagram - a diagram that describes procedural logic, business process or work flow. An activity diagram contains a number of Activities and connected by Control Flows and Object Flows. Active class - a class defining active objects