University of Tokyo; Tokyo University
Abbreviation of 東京大学. Used in both formal and informal contexts, but the full name is preferred in very formal writing.
He is a student at the University of Tokyo.
He got accepted into the University of Tokyo last year.
After graduating from the University of Tokyo, I went on to graduate school.
After graduating from the University of Tokyo, she got a job at a large company.
東大 is the common abbreviation used in everyday speech, while 東京大学 is the full, formal name used in official contexts.
Abbreviation formed from the first characters of 東京 (Tokyo) and 大学 (university).