This is the 9218th most frequent Japanese word.
理大
"理大" is short for 理工大学, meaning "university of science and technology" in English.
Used as a proper noun referring to a university name.
理大は工学部が有名です。
Ridai is famous for its engineering department.
Used as a proper noun indicating affiliation with the university.
彼は理大の学生です。
He is a student of Ridai.
Used as a proper noun mentioning the university's location.