red gate; Akamon (gate of the University of Tokyo)
Refers to a red gate, especially the famous Akamon at the University of Tokyo. Often used as a symbol of the university.
東京大学の赤門は有名な観光スポットです。
The Akamon of the University of Tokyo is a famous tourist spot.
Compound of 赤 (aka, 'red') and 門 (mon, 'gate').