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2. Multiview orthographic projection - Wikipedia

   en.wikipedia.org/wiki/Multiview_orthographic...

   Comparison of first and third-angle projections showing that related parts in the views are closer in third-angle. In first-angle projection, the object is conceptually located in quadrant I, i.e. it floats above and before the viewing planes, the planes are opaque, and each view is pushed through the object onto the plane furthest from it ...

3. Orthographic projection - Wikipedia

   en.wikipedia.org/wiki/Orthographic_projection

   Orthographic projection (also orthogonal projection and analemma) [a] is a means of representing three-dimensional objects in two dimensions.Orthographic projection is a form of parallel projection in which all the projection lines are orthogonal to the projection plane, [2] resulting in every plane of the scene appearing in affine transformation on the viewing surface.

4. Engineering drawing - Wikipedia

   en.wikipedia.org/wiki/Engineering_drawing

   Until the late 19th century, first-angle projection was the norm in North America as well as Europe; [7] [8] but circa the 1890s, third-angle projection spread throughout the North American engineering and manufacturing communities to the point of becoming a widely followed convention, [7] [8] and it was an ASA standard by the 1950s. [8]

5. File:First angle projection symbol.svg - Wikipedia

   en.wikipedia.org/wiki/File:First_angle...

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6. Table of mathematical symbols by introduction date - Wikipedia

   en.wikipedia.org/wiki/Table_of_mathematical...

   The following table lists many specialized symbols commonly used in modern mathematics, ordered by their introduction date. The table can also be ordered alphabetically by clicking on the relevant header title.

7. Technical drawing - Wikipedia

   en.wikipedia.org/wiki/Technical_drawing

   There are two conventions for using multiview, first-angle and third-angle. In both cases, the front or main side of the object is the same. First-angle is drawing the object sides based on where they land. Example, looking at the front side, rotate the object 90 degrees to the right. What is seen will be drawn to the right of the front side.