Name: Platinum Symbol: Pt Atomic Number: Atomic Mass: amu. Melting Point: °C ( K, °F) Boiling Point: °C ( K Symbol : Pt. Hallmarking of platinum jewellery, weighing over g has been compulsory you can see the second stamp is the traditional fineness symbol. Like every commodity, platinum has its own ticker symbol, contract value and margin requirements. To successfully trade a commodity, you must be aware of Ticker Symbol : Open Outcry: PL (NYMEX); CME.