I'm applying to Ph.D. programs, and the online application asks me to enter the college's term system. They write that "Term system refers to the type of hours your credits are worth, not the length of the term or how many terms a year your college offered", but the problem is that I did not have this credit-hour system in the universities I have attended, and I do not know what to fill as it is a required field. Even if I take it to mean the number of terms per year, the problem is that one college had only one term per year--which doesn't match any of the listed options (trimester, semester, quarter).
I have emailed the concerned university, but I did not receive a reply. Can someone please help me as to what I should do as I am not very aware of the American education system.