Is there a symbol for "risk free rate"

>> 10 year is not risk free. I look at the 3 month and 6 month t-bills

I am not exactly sure what I am looking for. What I do look for is when calculating option values using the "black-scholes". One parameter that is needed in the equations is the "risk free interest rate".

I will do a backtest on historical data. Then I would like to put in the "risk free interest rate" that was on that particular date in the backtest to be so accurate as possible. I can see that different rates affects the Theta value much. I would look at options with for example max 60 DTE.

Then I wonder if there is a ticker symbol with historical values for this in some way?
 
I am not sure what chart that is? I see values like this for example: "99.6025s" compared to "Yield 1.56%" in the chart I showed.
Is "99.6025s" a risk free rate?
 
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