+ = Manufacturer-specific variant of a base material
ABS = Acrylonitrile Butadiene Styrene
ASA = Acrylonitrile Styrene Acrylate
HIPS = High-Impact PolyStyrene, polystyrene chemically bonded with polybutadiene, soluble with limonene
Nylon = PolyAmide (maybe it should say PA instead of Nylon?)
PBS = PolyButylene Succinate, a lesser known flexible material
PC = PolyCarbonate
PEEK = PolyEther Ether Ketone
PEI = PolyEtherImide
PEKK = PolyEtherKetoneKetone
PETG = PolyEthylene Terephthalate, Glycol-modified
PETT = PolyEthylene coTrimethylene Terephthalate
PLA = PolyLactic Acid, easy to print, common/recommended starter material
PMMA = PolyMethyl MethActrylate, also known as acrylic
POM = PolyOxyMethylene
PP = PolyPropylene
PPS = PolyPhenylene Sulfide
PVA = PolyVinyl Alcohol, water soluble, also used for packaging laundry detergent and dishwasher tablets
PVDF = PolyVinylidene DiFluoride
TPC = Thermoplastic CoPolyester, a larger category including PETG among others
TPU = Thermoplastic PolyUrethane