A3 Size *-*
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That depends on the drawing size, larger size drawings will usually use larger characters.
A 2-dimensional drawing would be comprised of flat shapes: squares, rectangles, triangles, circles, etc. A 3-dimensional drawing would be made of shapes that imply depth: cubes, pyramids, cones, spheres, etc. A scaled drawing is referenced to an "original" drawing or object and is proportionately the same as the original. Scaled drawings allow one to draw the original in a larger or smaller size (scale) without changing how the individual parts of the original relate to each other.
s4
this should be specified on the drawing somewhere or in the title block
size threads per inch fit class