STL Format, aka Stereolithography Format, is a data notation created in 1987 by Chuck Hull.
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STL (Stereolithography) is a file format native to the stereolithography CAD software created by 3D Systems. It describes the surface geometry of a 3D object using triangular meshes, widely used in 3D printing, rapid prototyping, and computer-aided manufacturing. STL files can be stored in ASCII or binary formats.
solid HelloWorld
facet normal 0.0 0.0 1.0
outer loop
vertex 0.0 0.0 0.0
vertex 1.0 0.0 0.0
vertex 0.0 1.0 0.0
endloop
endfacet
endsolid HelloWorld