A trading symbol is a unique combination of letters assigned to a company's stock that is traded on a stock exchange. It is used to identify and differentiate different stocks on the market. Full definition
Look for the ethereum trading symbol in the price chart below. (daytrading.com)
Since you already own the security, finding the stock trading symbol should be as simple as looking at your discount brokerage account. (moneysmartsblog.com)
Then click on the properties for a particular trading symbol and it will give you all the details including the swap rates. (eightcap.com)