STL may refer to:
STL (STereoLithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL has several after-the-fact backronyms such as "Standard Triangle Language" and "Standard Tessellation Language". This file format is supported by many other software packages; it is widely used for rapid prototyping, 3D printing and computer-aided manufacturing. STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes. The STL format specifies both ASCII and binary representations. Binary files are more common, since they are more compact.
An STL file describes a raw unstructured triangulated surface by the unit normal and vertices (ordered by the right-hand rule) of the triangles using a three-dimensional Cartesian coordinate system. STL coordinates must be positive numbers, there is no scale information, and the units are arbitrary.
An ASCII STL file begins with the line
Who says the earth is crumbling
And no sky is falling through?
Sometimes, I just can't die
The world should be assembling
But not just right out of view
Whole days I like to fry
Easy action, got a rocket in your pocket
When you're a jet, you're a jet all the way
From your first cigarette to your last dying day
Who says the earth is trembling