I'm not sure what they meant, either. It's just a thing I've heard, verbatim.
I think "extruded" in this context comes from CAD terms, wherein: One builds the 2D cross-section of whatever complexity is entailed, and then mashes the "Extrude" button to add a third dimension to the shape.
I don't think the term, as-used, has anything at all to do with extrusion as a manufacturing process.
I think "extruded" in this context comes from CAD terms, wherein: One builds the 2D cross-section of whatever complexity is entailed, and then mashes the "Extrude" button to add a third dimension to the shape.
I don't think the term, as-used, has anything at all to do with extrusion as a manufacturing process.