The ITS (International Temperature Scale) uses 17 temperature reference points:

ElementSymbolTypeK°C
HeliumHeVapour pressure5-268.15
HydrogenH2Triple point13.8033-259.3467
HydrogenH2Vapour pressure17-256.15
HydrogenH2Vapour pressure20.3-252.85
NeonNeTriple point24.5561-248.5939
OxygenO2Triple point54.3584-218.7916
ArgonArTriple point83.8058-189.3442
MercuryHgTriple point234.315-38.8344
WaterH2OTriple point273.160.01
GalliumGaMelting302.914629.7646
IndiumInFreezing429.7485156.5985
TinSnFreezing505.078231.928
ZincZnFreezing692.677419.527
AluminiumAlSolidification933.473660.323
SilverAgFreezing1234.93961.78
GoldAuFreezing1337.331064.18
CopperCuFreezing1357.771084.62