From FreeCAD Documentation
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- OCC
- Acronym for Open CASCADE. Prior to being open sourced, it used to be named CAS.CADE (abbreviated from Computer Aided Software for Computer Aided Design and Engineering).
- OCE
- Open CASCADE Community Edition. It provides patches, improvements and experiments contributed by users over the official Open CASCADE library. FreeCAD is known to work on either OCC or OCE.
- OCCT
- Open CASCADE Technology. See OCC.
- Open CASCADE
- The geometric modeling kernel (software library) underlying FreeCAD. Also called OCC or OCCT (for Open CASCADE Technology). See also OCE.
- OpenSCAD
- 1. Name of a script-only based CAD program.
- 2. A workbench in FreeCAD. The OpenSCAD workbench provides an interface for import/export of *.scad and *.csg models, as well as a some utility tools.
- Origin
- The center of the coordinate system. Everything goes out from here in either the positive or negative directions. As is our view of the universe with Earth being the “origin”.
- Orthographic
- See Orthographic projection and Multiview orthographic projection.