I cannot find any information about it on their website. Please let me know! (University of Rochester)
It says one teacher rec. When you assemble your Common app or coalition app. you’ll direct one of your LORs to them.
Rochester also lets your parent, or any other person, submit an optional rec. If it is a top choice, I recommend doing this. They definitely consider the additional rec letters.
Often there are X letters required and Y letters allowed – usually something you can see via the Common App.
I don’t know what it is this year, but last year URoch required one teacher recommendation, but allowed up to four, as well as a community recommendation. Which is not to say you should send five letters. Just that you have that option if they genuinely support your case. (Numbers might be different this year. But the common app is open so go see for yourself.)