Short for Acrylonitrile Butadiene Styrene, a petroleum-based thermoplastic used to make filament for FDM-type 3D printers.
Being petroleum-based, ABS is non biodegradable, but it can be recycled. ABS is very strong, is soluble in Acetone and can easily be post-processed. Its melting temperature lies around 210-230°C and due to its shrinkage properties (a.k.a. warping) the use of a heated printbed is recommended.