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I guess you could replace nu (the greek letter that stands for frequency and looks like a V) with Hz so that it could be easier to differentiate in your own work, but I would make sure to be careful because the question will most likely give you the frequency with a V instead of Hertz.
No, to my knowledge there isn't another variable to use, but the v for velocity and v for frequency are normally written differently (i.e the v for frequency is usually curvy-ish). However, if you want to replace v with another variable you can either write in nu as recommended before or make your own key to use! (Just make sure to make it clear on tests/ homework probably and don't use variables used elsewhere either.)
My high school teacher used lowercase "f" to represent frequency, which was pretty useful in the context of high school chemistry, and which wasn't ever confused with v or even capital F for force. I'm not sure if a new variable "f" will be introduced later on, but this has worked for me.
The variables representing different values can be manipulated to your benefit, if you were to chose any other variable that you would know for a fact you would be able to distinguish, I don't see a reason why you shouldn't. The answer won't be any different as long as the true representations of these variables remain universal.
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